21981920

素因数分解:

$2^5\times 5^1\times {\mathrm{137387}}^1$

素因数の和:137402

約数の個数: 24

約数和(自身を含む): 51932664

約数和(自身を除く): 29950744

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 137387, 274774, 549548, 686935, 1099096, 1373870, 2198192, 2747740, 4396384, 5495480, 10990960, 21981920]

約数ペア:

[(1, 21981920), (2, 10990960), (4, 5495480), (5, 4396384), (8, 2747740), (10, 2198192), (16, 1373870), (20, 1099096), (32, 686935), (40, 549548), (80, 274774), (160, 137387)]