21798640

素因数分解:

$2^4\times 5^1\times {\mathrm{521}}^1\times {\mathrm{523}}^1$

素因数の和:1057

約数の個数: 40

約数和(自身を含む): 50876208

約数和(自身を除く): 29077568

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 521, 523, 1042, 1046, 2084, 2092, 2605, 2615, 4168, 4184, 5210, 5230, 8336, 8368, 10420, 10460, 20840, 20920, 41680, 41840, 272483, 544966, 1089932, 1362415, 2179864, 2724830, 4359728, 5449660, 10899320, 21798640]

約数ペア:

[(1, 21798640), (2, 10899320), (4, 5449660), (5, 4359728), (8, 2724830), (10, 2179864), (16, 1362415), (20, 1089932), (40, 544966), (80, 272483), (521, 41840), (523, 41680), (1042, 20920), (1046, 20840), (2084, 10460), (2092, 10420), (2605, 8368), (2615, 8336), (4168, 5230), (4184, 5210)]