21281895

素因数分解:

$3^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{6661}}^1$

素因数の和:6743

約数の個数: 24

約数和(自身を含む): 37413792

約数和(自身を除く): 16131897

約数列:

[1, 3, 5, 9, 15, 45, 71, 213, 355, 639, 1065, 3195, 6661, 19983, 33305, 59949, 99915, 299745, 472931, 1418793, 2364655, 4256379, 7093965, 21281895]

約数ペア:

[(1, 21281895), (3, 7093965), (5, 4256379), (9, 2364655), (15, 1418793), (45, 472931), (71, 299745), (213, 99915), (355, 59949), (639, 33305), (1065, 19983), (3195, 6661)]