21549820

素因数分解:

$2^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{6863}}^1$

素因数の和:7029

約数の個数: 24

約数和(自身を含む): 45549504

約数和(自身を除く): 23999684

約数列:

[1, 2, 4, 5, 10, 20, 157, 314, 628, 785, 1570, 3140, 6863, 13726, 27452, 34315, 68630, 137260, 1077491, 2154982, 4309964, 5387455, 10774910, 21549820]

約数ペア:

[(1, 21549820), (2, 10774910), (4, 5387455), (5, 4309964), (10, 2154982), (20, 1077491), (157, 137260), (314, 68630), (628, 34315), (785, 27452), (1570, 13726), (3140, 6863)]