81302020

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1\times {\mathrm{647}}^1$

素因数の和:820

約数の個数: 48

約数和(自身を含む): 175488768

約数和(自身を除く): 94186748

約数列:

[1, 2, 4, 5, 10, 20, 61, 103, 122, 206, 244, 305, 412, 515, 610, 647, 1030, 1220, 1294, 2060, 2588, 3235, 6283, 6470, 12566, 12940, 25132, 31415, 39467, 62830, 66641, 78934, 125660, 133282, 157868, 197335, 266564, 333205, 394670, 666410, 789340, 1332820, 4065101, 8130202, 16260404, 20325505, 40651010, 81302020]

約数ペア:

[(1, 81302020), (2, 40651010), (4, 20325505), (5, 16260404), (10, 8130202), (20, 4065101), (61, 1332820), (103, 789340), (122, 666410), (206, 394670), (244, 333205), (305, 266564), (412, 197335), (515, 157868), (610, 133282), (647, 125660), (1030, 78934), (1220, 66641), (1294, 62830), (2060, 39467), (2588, 31415), (3235, 25132), (6283, 12940), (6470, 12566)]