304 Jean-Marie De Koninck
x y z
3 2 1
71 17 2
21063928 76271 17
21 621 600
the 14th colossally abundant number (see the number 55 440).
21 772 800
the smallest number 2 which is equal to the product of the factorials of its
digits in base 12: 21 772 800 = [7, 3, 6, 0, 0, 0, 0]12 = 7! · 3! · 6! · 0! · 0! · 0! · 0!; the
only known numbers satisfying this property are
1, 2, 21 772 800, 2 090 188 800,
14 497 650 943 439 560 735 142 707 200 000 000,
75 445 311 584 829 283 999 739 123 702 169 600 000 000 000,
962 493 562 543 459 590 626 671 870 630 428 672 000 000 000 000 and
45 883 517 654 351 824 863 158 584 663 538 863 253 527 461 888 000 000 000 000 000
(see
the number 17 280 for the table of the smallest numbers with this property in
a given base).
22 013 952
the
15th
number n such that φ(n) + σ(n) = 3n (see the number 312).
22 145 328
the smallest eight digit Sastry number (see the number 6 099).
22 368 256
the
13th
Euler number (see the number 272).
23 002 083 (= 33 · 132 · 712)
the 10
000th
powerful number (see the number 3 136).
23 336 172
the 16th number n such that φ(n) + σ(n) = 3n (see the number 312).
23 569 920 (=
29
·
33
· 5 · 11 · 31)
the fourth 4-perfect number (see the number 30 240).
Previous Page Next Page