21304420

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25981}}^1$

素因数の和:26031

約数の個数: 24

約数和(自身を含む): 45832248

約数和(自身を除く): 24527828

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25981, 51962, 103924, 129905, 259810, 519620, 1065221, 2130442, 4260884, 5326105, 10652210, 21304420]

約数ペア:

[(1, 21304420), (2, 10652210), (4, 5326105), (5, 4260884), (10, 2130442), (20, 1065221), (41, 519620), (82, 259810), (164, 129905), (205, 103924), (410, 51962), (820, 25981)]