20518745

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{599}}^1$

素因数の和:665

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 8511655

約数列:

[1, 5, 13, 17, 31, 65, 85, 155, 221, 403, 527, 599, 1105, 2015, 2635, 2995, 6851, 7787, 10183, 18569, 34255, 38935, 50915, 92845, 132379, 241397, 315673, 661895, 1206985, 1578365, 4103749, 20518745]

約数ペア:

[(1, 20518745), (5, 4103749), (13, 1578365), (17, 1206985), (31, 661895), (65, 315673), (85, 241397), (155, 132379), (221, 92845), (403, 50915), (527, 38935), (599, 34255), (1105, 18569), (2015, 10183), (2635, 7787), (2995, 6851)]