20978165

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{359}}^1$

素因数の和:437

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 8052235

約数列:

[1, 5, 13, 29, 31, 65, 145, 155, 359, 377, 403, 899, 1795, 1885, 2015, 4495, 4667, 10411, 11129, 11687, 23335, 52055, 55645, 58435, 135343, 144677, 322741, 676715, 723385, 1613705, 4195633, 20978165]

約数ペア:

[(1, 20978165), (5, 4195633), (13, 1613705), (29, 723385), (31, 676715), (65, 322741), (145, 144677), (155, 135343), (359, 58435), (377, 55645), (403, 52055), (899, 23335), (1795, 11687), (1885, 11129), (2015, 10411), (4495, 4667)]