21109820

素因数分解:

$2^2\times 5^1\times {\mathrm{541}}^1\times {\mathrm{1951}}^1$

素因数の和:2501

約数の個数: 24

約数和(自身を含む): 44435328

約数和(自身を除く): 23325508

約数列:

[1, 2, 4, 5, 10, 20, 541, 1082, 1951, 2164, 2705, 3902, 5410, 7804, 9755, 10820, 19510, 39020, 1055491, 2110982, 4221964, 5277455, 10554910, 21109820]

約数ペア:

[(1, 21109820), (2, 10554910), (4, 5277455), (5, 4221964), (10, 2110982), (20, 1055491), (541, 39020), (1082, 19510), (1951, 10820), (2164, 9755), (2705, 7804), (3902, 5410)]