20991020

素因数分解:

$2^2\times 5^1\times {\mathrm{59}}^1\times {\mathrm{17789}}^1$

素因数の和:17857

約数の個数: 24

約数和(自身を含む): 44830800

約数和(自身を除く): 23839780

約数列:

[1, 2, 4, 5, 10, 20, 59, 118, 236, 295, 590, 1180, 17789, 35578, 71156, 88945, 177890, 355780, 1049551, 2099102, 4198204, 5247755, 10495510, 20991020]

約数ペア:

[(1, 20991020), (2, 10495510), (4, 5247755), (5, 4198204), (10, 2099102), (20, 1049551), (59, 355780), (118, 177890), (236, 88945), (295, 71156), (590, 35578), (1180, 17789)]