81408020

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{191}}^1\times {\mathrm{211}}^1$

素因数の和:512

約数の個数: 48

約数和(自身を含む): 174375936

約数和(自身を除く): 92967916

約数列:

[1, 2, 4, 5, 10, 20, 101, 191, 202, 211, 382, 404, 422, 505, 764, 844, 955, 1010, 1055, 1910, 2020, 2110, 3820, 4220, 19291, 21311, 38582, 40301, 42622, 77164, 80602, 85244, 96455, 106555, 161204, 192910, 201505, 213110, 385820, 403010, 426220, 806020, 4070401, 8140802, 16281604, 20352005, 40704010, 81408020]

約数ペア:

[(1, 81408020), (2, 40704010), (4, 20352005), (5, 16281604), (10, 8140802), (20, 4070401), (101, 806020), (191, 426220), (202, 403010), (211, 385820), (382, 213110), (404, 201505), (422, 192910), (505, 161204), (764, 106555), (844, 96455), (955, 85244), (1010, 80602), (1055, 77164), (1910, 42622), (2020, 40301), (2110, 38582), (3820, 21311), (4220, 19291)]