21515240

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17351}}^1$

素因数の和:17393

約数の個数: 32

約数和(自身を含む): 49973760

約数和(自身を除く): 28458520

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17351, 34702, 69404, 86755, 138808, 173510, 347020, 537881, 694040, 1075762, 2151524, 2689405, 4303048, 5378810, 10757620, 21515240]

約数ペア:

[(1, 21515240), (2, 10757620), (4, 5378810), (5, 4303048), (8, 2689405), (10, 2151524), (20, 1075762), (31, 694040), (40, 537881), (62, 347020), (124, 173510), (155, 138808), (248, 86755), (310, 69404), (620, 34702), (1240, 17351)]