21398965

素因数分解:

$5^1\times 7^1\times {\mathrm{151}}^1\times {\mathrm{4049}}^1$

素因数の和:4212

約数の個数: 16

約数和(自身を含む): 29548800

約数和(自身を除く): 8149835

約数列:

[1, 5, 7, 35, 151, 755, 1057, 4049, 5285, 20245, 28343, 141715, 611399, 3056995, 4279793, 21398965]

約数ペア:

[(1, 21398965), (5, 4279793), (7, 3056995), (35, 611399), (151, 141715), (755, 28343), (1057, 20245), (4049, 5285)]