21561640

素因数分解:

$2^3\times 5^1\times {\mathrm{163}}^1\times {\mathrm{3307}}^1$

素因数の和:3481

約数の個数: 32

約数和(自身を含む): 48826080

約数和(自身を除く): 27264440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 163, 326, 652, 815, 1304, 1630, 3260, 3307, 6520, 6614, 13228, 16535, 26456, 33070, 66140, 132280, 539041, 1078082, 2156164, 2695205, 4312328, 5390410, 10780820, 21561640]

約数ペア:

[(1, 21561640), (2, 10780820), (4, 5390410), (5, 4312328), (8, 2695205), (10, 2156164), (20, 1078082), (40, 539041), (163, 132280), (326, 66140), (652, 33070), (815, 26456), (1304, 16535), (1630, 13228), (3260, 6614), (3307, 6520)]