20521240

素因数分解:

$2^3\times 5^1\times {\mathrm{513031}}^1$

素因数の和:513042

約数の個数: 16

約数和(自身を含む): 46172880

約数和(自身を除く): 25651640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 513031, 1026062, 2052124, 2565155, 4104248, 5130310, 10260620, 20521240]

約数ペア:

[(1, 20521240), (2, 10260620), (4, 5130310), (5, 4104248), (8, 2565155), (10, 2052124), (20, 1026062), (40, 513031)]