21530980

素因数分解:

$2^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{6857}}^1$

素因数の和:7023

約数の個数: 24

約数和(自身を含む): 45509688

約数和(自身を除く): 23978708

約数列:

[1, 2, 4, 5, 10, 20, 157, 314, 628, 785, 1570, 3140, 6857, 13714, 27428, 34285, 68570, 137140, 1076549, 2153098, 4306196, 5382745, 10765490, 21530980]

約数ペア:

[(1, 21530980), (2, 10765490), (4, 5382745), (5, 4306196), (10, 2153098), (20, 1076549), (157, 137140), (314, 68570), (628, 34285), (785, 27428), (1570, 13714), (3140, 6857)]