21991185

素因数分解:

$3^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{6883}}^1$

素因数の和:6965

約数の個数: 24

約数和(自身を含む): 38660544

約数和(自身を除く): 16669359

約数列:

[1, 3, 5, 9, 15, 45, 71, 213, 355, 639, 1065, 3195, 6883, 20649, 34415, 61947, 103245, 309735, 488693, 1466079, 2443465, 4398237, 7330395, 21991185]

約数ペア:

[(1, 21991185), (3, 7330395), (5, 4398237), (9, 2443465), (15, 1466079), (45, 488693), (71, 309735), (213, 103245), (355, 61947), (639, 34415), (1065, 20649), (3195, 6883)]