21791780

素因数分解:

$2^2\times 5^1\times {\mathrm{389}}^1\times {\mathrm{2801}}^1$

素因数の和:3199

約数の個数: 24

約数和(自身を含む): 45896760

約数和(自身を除く): 24104980

約数列:

[1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 2801, 3890, 5602, 7780, 11204, 14005, 28010, 56020, 1089589, 2179178, 4358356, 5447945, 10895890, 21791780]

約数ペア:

[(1, 21791780), (2, 10895890), (4, 5447945), (5, 4358356), (10, 2179178), (20, 1089589), (389, 56020), (778, 28010), (1556, 14005), (1945, 11204), (2801, 7780), (3890, 5602)]