21821780

素因数分解:

$2^2\times 5^1\times {\mathrm{691}}^1\times {\mathrm{1579}}^1$

素因数の和:2279

約数の個数: 24

約数和(自身を含む): 45921120

約数和(自身を除く): 24099340

約数列:

[1, 2, 4, 5, 10, 20, 691, 1382, 1579, 2764, 3158, 3455, 6316, 6910, 7895, 13820, 15790, 31580, 1091089, 2182178, 4364356, 5455445, 10910890, 21821780]

約数ペア:

[(1, 21821780), (2, 10910890), (4, 5455445), (5, 4364356), (10, 2182178), (20, 1091089), (691, 31580), (1382, 15790), (1579, 13820), (2764, 7895), (3158, 6910), (3455, 6316)]