20391875

素因数分解:

$5^4\times 7^1\times {\mathrm{59}}^1\times {\mathrm{79}}^1$

素因数の和:165

約数の個数: 40

約数和(自身を含む): 29990400

約数和(自身を除く): 9598525

約数列:

[1, 5, 7, 25, 35, 59, 79, 125, 175, 295, 395, 413, 553, 625, 875, 1475, 1975, 2065, 2765, 4375, 4661, 7375, 9875, 10325, 13825, 23305, 32627, 36875, 49375, 51625, 69125, 116525, 163135, 258125, 345625, 582625, 815675, 2913125, 4078375, 20391875]

約数ペア:

[(1, 20391875), (5, 4078375), (7, 2913125), (25, 815675), (35, 582625), (59, 345625), (79, 258125), (125, 163135), (175, 116525), (295, 69125), (395, 51625), (413, 49375), (553, 36875), (625, 32627), (875, 23305), (1475, 13825), (1975, 10325), (2065, 9875), (2765, 7375), (4375, 4661)]