21705975

素因数分解:

$3^7\times 5^2\times {\mathrm{397}}^1$

素因数の和:428

約数の個数: 48

約数和(自身を含む): 40468640

約数和(自身を除く): 18762665

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 81, 135, 225, 243, 397, 405, 675, 729, 1191, 1215, 1985, 2025, 2187, 3573, 3645, 5955, 6075, 9925, 10719, 10935, 17865, 18225, 29775, 32157, 53595, 54675, 89325, 96471, 160785, 267975, 289413, 482355, 803925, 868239, 1447065, 2411775, 4341195, 7235325, 21705975]

約数ペア:

[(1, 21705975), (3, 7235325), (5, 4341195), (9, 2411775), (15, 1447065), (25, 868239), (27, 803925), (45, 482355), (75, 289413), (81, 267975), (135, 160785), (225, 96471), (243, 89325), (397, 54675), (405, 53595), (675, 32157), (729, 29775), (1191, 18225), (1215, 17865), (1985, 10935), (2025, 10719), (2187, 9925), (3573, 6075), (3645, 5955)]