21536780

素因数分解:

$2^2\times 5^1\times {\mathrm{971}}^1\times {\mathrm{1109}}^1$

素因数の和:2089

約数の個数: 24

約数和(自身を含む): 45314640

約数和(自身を除く): 23777860

約数列:

[1, 2, 4, 5, 10, 20, 971, 1109, 1942, 2218, 3884, 4436, 4855, 5545, 9710, 11090, 19420, 22180, 1076839, 2153678, 4307356, 5384195, 10768390, 21536780]

約数ペア:

[(1, 21536780), (2, 10768390), (4, 5384195), (5, 4307356), (10, 2153678), (20, 1076839), (971, 22180), (1109, 19420), (1942, 11090), (2218, 9710), (3884, 5545), (4436, 4855)]