21082420

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{163}}^1\times {\mathrm{223}}^1$

素因数の和:424

約数の個数: 48

約数和(自身を含む): 46287360

約数和(自身を除く): 25204940

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 163, 223, 290, 326, 446, 580, 652, 815, 892, 1115, 1630, 2230, 3260, 4460, 4727, 6467, 9454, 12934, 18908, 23635, 25868, 32335, 36349, 47270, 64670, 72698, 94540, 129340, 145396, 181745, 363490, 726980, 1054121, 2108242, 4216484, 5270605, 10541210, 21082420]

約数ペア:

[(1, 21082420), (2, 10541210), (4, 5270605), (5, 4216484), (10, 2108242), (20, 1054121), (29, 726980), (58, 363490), (116, 181745), (145, 145396), (163, 129340), (223, 94540), (290, 72698), (326, 64670), (446, 47270), (580, 36349), (652, 32335), (815, 25868), (892, 23635), (1115, 18908), (1630, 12934), (2230, 9454), (3260, 6467), (4460, 4727)]