21297580

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{139}}^1\times {\mathrm{163}}^1$

素因数の和:358

約数の個数: 48

約数和(自身を含む): 46287360

約数和(自身を除く): 24989780

約数列:

[1, 2, 4, 5, 10, 20, 47, 94, 139, 163, 188, 235, 278, 326, 470, 556, 652, 695, 815, 940, 1390, 1630, 2780, 3260, 6533, 7661, 13066, 15322, 22657, 26132, 30644, 32665, 38305, 45314, 65330, 76610, 90628, 113285, 130660, 153220, 226570, 453140, 1064879, 2129758, 4259516, 5324395, 10648790, 21297580]

約数ペア:

[(1, 21297580), (2, 10648790), (4, 5324395), (5, 4259516), (10, 2129758), (20, 1064879), (47, 453140), (94, 226570), (139, 153220), (163, 130660), (188, 113285), (235, 90628), (278, 76610), (326, 65330), (470, 45314), (556, 38305), (652, 32665), (695, 30644), (815, 26132), (940, 22657), (1390, 15322), (1630, 13066), (2780, 7661), (3260, 6533)]