21491715

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{1039}}^1$

素因数の和:1251

約数の個数: 32

約数和(自身を含む): 39536640

約数和(自身を除く): 18044925

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 197, 591, 985, 1039, 1379, 2955, 3117, 4137, 5195, 6895, 7273, 15585, 20685, 21819, 36365, 109095, 204683, 614049, 1023415, 1432781, 3070245, 4298343, 7163905, 21491715]

約数ペア:

[(1, 21491715), (3, 7163905), (5, 4298343), (7, 3070245), (15, 1432781), (21, 1023415), (35, 614049), (105, 204683), (197, 109095), (591, 36365), (985, 21819), (1039, 20685), (1379, 15585), (2955, 7273), (3117, 6895), (4137, 5195)]