21216820

素因数分解:

$2^2\times 5^1\times {\mathrm{181}}^1\times {\mathrm{5861}}^1$

素因数の和:6051

約数の個数: 24

約数和(自身を含む): 44809128

約数和(自身を除く): 23592308

約数列:

[1, 2, 4, 5, 10, 20, 181, 362, 724, 905, 1810, 3620, 5861, 11722, 23444, 29305, 58610, 117220, 1060841, 2121682, 4243364, 5304205, 10608410, 21216820]

約数ペア:

[(1, 21216820), (2, 10608410), (4, 5304205), (5, 4243364), (10, 2121682), (20, 1060841), (181, 117220), (362, 58610), (724, 29305), (905, 23444), (1810, 11722), (3620, 5861)]