21240980

素因数分解:

$2^2\times 5^1\times {\mathrm{271}}^1\times {\mathrm{3919}}^1$

素因数の和:4199

約数の個数: 24

約数和(自身を含む): 44782080

約数和(自身を除く): 23541100

約数列:

[1, 2, 4, 5, 10, 20, 271, 542, 1084, 1355, 2710, 3919, 5420, 7838, 15676, 19595, 39190, 78380, 1062049, 2124098, 4248196, 5310245, 10620490, 21240980]

約数ペア:

[(1, 21240980), (2, 10620490), (4, 5310245), (5, 4248196), (10, 2124098), (20, 1062049), (271, 78380), (542, 39190), (1084, 19595), (1355, 15676), (2710, 7838), (3919, 5420)]