20904815

素因数分解:

$5^1\times {\mathrm{17}}^3\times {\mathrm{23}}^1\times {\mathrm{37}}^1$

素因数の和:116

約数の個数: 32

約数和(自身を含む): 28563840

約数和(自身を除く): 7659025

約数列:

[1, 5, 17, 23, 37, 85, 115, 185, 289, 391, 629, 851, 1445, 1955, 3145, 4255, 4913, 6647, 10693, 14467, 24565, 33235, 53465, 72335, 112999, 181781, 245939, 564995, 908905, 1229695, 4180963, 20904815]

約数ペア:

[(1, 20904815), (5, 4180963), (17, 1229695), (23, 908905), (37, 564995), (85, 245939), (115, 181781), (185, 112999), (289, 72335), (391, 53465), (629, 33235), (851, 24565), (1445, 14467), (1955, 10693), (3145, 6647), (4255, 4913)]