21705520

素因数分解:

$2^4\times 5^1\times {\mathrm{181}}^1\times {\mathrm{1499}}^1$

素因数の和:1693

約数の個数: 40

約数和(自身を含む): 50778000

約数和(自身を除く): 29072480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 181, 362, 724, 905, 1448, 1499, 1810, 2896, 2998, 3620, 5996, 7240, 7495, 11992, 14480, 14990, 23984, 29980, 59960, 119920, 271319, 542638, 1085276, 1356595, 2170552, 2713190, 4341104, 5426380, 10852760, 21705520]

約数ペア:

[(1, 21705520), (2, 10852760), (4, 5426380), (5, 4341104), (8, 2713190), (10, 2170552), (16, 1356595), (20, 1085276), (40, 542638), (80, 271319), (181, 119920), (362, 59960), (724, 29980), (905, 23984), (1448, 14990), (1499, 14480), (1810, 11992), (2896, 7495), (2998, 7240), (3620, 5996)]