21513505

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{101}}^1\times {\mathrm{113}}^1$

素因数の和:261

約数の個数: 32

約数和(自身を含む): 29302560

約数和(自身を除く): 7789055

約数列:

[1, 5, 13, 29, 65, 101, 113, 145, 377, 505, 565, 1313, 1469, 1885, 2929, 3277, 6565, 7345, 11413, 14645, 16385, 38077, 42601, 57065, 148369, 190385, 213005, 330977, 741845, 1654885, 4302701, 21513505]

約数ペア:

[(1, 21513505), (5, 4302701), (13, 1654885), (29, 741845), (65, 330977), (101, 213005), (113, 190385), (145, 148369), (377, 57065), (505, 42601), (565, 38077), (1313, 16385), (1469, 14645), (1885, 11413), (2929, 7345), (3277, 6565)]