21684820

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{15271}}^1$

素因数の和:15351

約数の個数: 24

約数和(自身を含む): 46182528

約数和(自身を除く): 24497708

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 15271, 30542, 61084, 76355, 152710, 305420, 1084241, 2168482, 4336964, 5421205, 10842410, 21684820]

約数ペア:

[(1, 21684820), (2, 10842410), (4, 5421205), (5, 4336964), (10, 2168482), (20, 1084241), (71, 305420), (142, 152710), (284, 76355), (355, 61084), (710, 30542), (1420, 15271)]