21291515

素因数分解:

$5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{5581}}^1$

素因数の和:5702

約数の個数: 16

約数和(自身を含む): 29472960

約数和(自身を除く): 8181445

約数列:

[1, 5, 7, 35, 109, 545, 763, 3815, 5581, 27905, 39067, 195335, 608329, 3041645, 4258303, 21291515]

約数ペア:

[(1, 21291515), (5, 4258303), (7, 3041645), (35, 608329), (109, 195335), (545, 39067), (763, 27905), (3815, 5581)]