257540

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{163}}^1$

素因数の和:251

約数の個数: 24

約数和(自身を含む): 551040

約数和(自身を除く): 293500

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 163, 316, 326, 395, 652, 790, 815, 1580, 1630, 3260, 12877, 25754, 51508, 64385, 128770, 257540]

約数ペア:

[(1, 257540), (2, 128770), (4, 64385), (5, 51508), (10, 25754), (20, 12877), (79, 3260), (158, 1630), (163, 1580), (316, 815), (326, 790), (395, 652)]