21790960

素因数分解:

$2^4\times 5^1\times {\mathrm{421}}^1\times {\mathrm{647}}^1$

素因数の和:1081

約数の個数: 40

約数和(自身を含む): 50862816

約数和(自身を除く): 29071856

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 421, 647, 842, 1294, 1684, 2105, 2588, 3235, 3368, 4210, 5176, 6470, 6736, 8420, 10352, 12940, 16840, 25880, 33680, 51760, 272387, 544774, 1089548, 1361935, 2179096, 2723870, 4358192, 5447740, 10895480, 21790960]

約数ペア:

[(1, 21790960), (2, 10895480), (4, 5447740), (5, 4358192), (8, 2723870), (10, 2179096), (16, 1361935), (20, 1089548), (40, 544774), (80, 272387), (421, 51760), (647, 33680), (842, 25880), (1294, 16840), (1684, 12940), (2105, 10352), (2588, 8420), (3235, 6736), (3368, 6470), (4210, 5176)]