20399380

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{12911}}^1$

素因数の和:12999

約数の個数: 24

約数和(自身を含む): 43384320

約数和(自身を除く): 22984940

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 12911, 25822, 51644, 64555, 129110, 258220, 1019969, 2039938, 4079876, 5099845, 10199690, 20399380]

約数ペア:

[(1, 20399380), (2, 10199690), (4, 5099845), (5, 4079876), (10, 2039938), (20, 1019969), (79, 258220), (158, 129110), (316, 64555), (395, 51644), (790, 25822), (1580, 12911)]