21041620

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^2\times {\mathrm{569}}^1$

素因数の和:664

約数の個数: 36

約数和(自身を含む): 45318420

約数和(自身を除く): 24276800

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 569, 860, 1138, 1849, 2276, 2845, 3698, 5690, 7396, 9245, 11380, 18490, 24467, 36980, 48934, 97868, 122335, 244670, 489340, 1052081, 2104162, 4208324, 5260405, 10520810, 21041620]

約数ペア:

[(1, 21041620), (2, 10520810), (4, 5260405), (5, 4208324), (10, 2104162), (20, 1052081), (43, 489340), (86, 244670), (172, 122335), (215, 97868), (430, 48934), (569, 36980), (860, 24467), (1138, 18490), (1849, 11380), (2276, 9245), (2845, 7396), (3698, 5690)]