21977980

素因数分解:

$2^2\times 5^1\times {\mathrm{359}}^1\times {\mathrm{3061}}^1$

素因数の和:3429

約数の個数: 24

約数和(自身を含む): 46297440

約数和(自身を除く): 24319460

約数列:

[1, 2, 4, 5, 10, 20, 359, 718, 1436, 1795, 3061, 3590, 6122, 7180, 12244, 15305, 30610, 61220, 1098899, 2197798, 4395596, 5494495, 10988990, 21977980]

約数ペア:

[(1, 21977980), (2, 10988990), (4, 5494495), (5, 4395596), (10, 2197798), (20, 1098899), (359, 61220), (718, 30610), (1436, 15305), (1795, 12244), (3061, 7180), (3590, 6122)]