665180

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{421}}^1$

素因数の和:509

約数の個数: 24

約数和(自身を含む): 1417920

約数和(自身を除く): 752740

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 421, 790, 842, 1580, 1684, 2105, 4210, 8420, 33259, 66518, 133036, 166295, 332590, 665180]

約数ペア:

[(1, 665180), (2, 332590), (4, 166295), (5, 133036), (10, 66518), (20, 33259), (79, 8420), (158, 4210), (316, 2105), (395, 1684), (421, 1580), (790, 842)]