21085220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81097}}^1$

素因数の和:81119

約数の個数: 24

約数和(自身を含む): 47685624

約数和(自身を除く): 26600404

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81097, 162194, 324388, 405485, 810970, 1054261, 1621940, 2108522, 4217044, 5271305, 10542610, 21085220]

約数ペア:

[(1, 21085220), (2, 10542610), (4, 5271305), (5, 4217044), (10, 2108522), (13, 1621940), (20, 1054261), (26, 810970), (52, 405485), (65, 324388), (130, 162194), (260, 81097)]