20953805

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1$

素因数の和:221

約数の個数: 32

約数和(自身を含む): 27855360

約数和(自身を除く): 6901555

約数列:

[1, 5, 23, 29, 61, 103, 115, 145, 305, 515, 667, 1403, 1769, 2369, 2987, 3335, 6283, 7015, 8845, 11845, 14935, 31415, 40687, 68701, 144509, 182207, 203435, 343505, 722545, 911035, 4190761, 20953805]

約数ペア:

[(1, 20953805), (5, 4190761), (23, 911035), (29, 722545), (61, 343505), (103, 203435), (115, 182207), (145, 144509), (305, 68701), (515, 40687), (667, 31415), (1403, 14935), (1769, 11845), (2369, 8845), (2987, 7015), (3335, 6283)]