21157969

素因数分解:

$7^1\times {\mathrm{37}}^1\times {\mathrm{151}}^1\times {\mathrm{541}}^1$

素因数の和:736

約数の個数: 16

約数和(自身を含む): 25044736

約数和(自身を除く): 3886767

約数列:

[1, 7, 37, 151, 259, 541, 1057, 3787, 5587, 20017, 39109, 81691, 140119, 571837, 3022567, 21157969]

約数ペア:

[(1, 21157969), (7, 3022567), (37, 571837), (151, 140119), (259, 81691), (541, 39109), (1057, 20017), (3787, 5587)]