21751335

素因数分解:

$3^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{1249}}^1$

素因数の和:1309

約数の個数: 40

約数和(自身を含む): 39930000

約数和(自身を除く): 18178665

約数列:

[1, 3, 5, 9, 15, 27, 43, 45, 81, 129, 135, 215, 387, 405, 645, 1161, 1249, 1935, 3483, 3747, 5805, 6245, 11241, 17415, 18735, 33723, 53707, 56205, 101169, 161121, 168615, 268535, 483363, 505845, 805605, 1450089, 2416815, 4350267, 7250445, 21751335]

約数ペア:

[(1, 21751335), (3, 7250445), (5, 4350267), (9, 2416815), (15, 1450089), (27, 805605), (43, 505845), (45, 483363), (81, 268535), (129, 168615), (135, 161121), (215, 101169), (387, 56205), (405, 53707), (645, 33723), (1161, 18735), (1249, 17415), (1935, 11241), (3483, 6245), (3747, 5805)]