21578360

素因数分解:

$2^3\times 5^1\times {\mathrm{139}}^1\times {\mathrm{3881}}^1$

素因数の和:4031

約数の個数: 32

約数和(自身を含む): 48913200

約数和(自身を除く): 27334840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 139, 278, 556, 695, 1112, 1390, 2780, 3881, 5560, 7762, 15524, 19405, 31048, 38810, 77620, 155240, 539459, 1078918, 2157836, 2697295, 4315672, 5394590, 10789180, 21578360]

約数ペア:

[(1, 21578360), (2, 10789180), (4, 5394590), (5, 4315672), (8, 2697295), (10, 2157836), (20, 1078918), (40, 539459), (139, 155240), (278, 77620), (556, 38810), (695, 31048), (1112, 19405), (1390, 15524), (2780, 7762), (3881, 5560)]