20391380

素因数分解:

$2^2\times 5^1\times {\mathrm{389}}^1\times {\mathrm{2621}}^1$

素因数の和:3019

約数の個数: 24

約数和(自身を含む): 42948360

約数和(自身を除く): 22556980

約数列:

[1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 2621, 3890, 5242, 7780, 10484, 13105, 26210, 52420, 1019569, 2039138, 4078276, 5097845, 10195690, 20391380]

約数ペア:

[(1, 20391380), (2, 10195690), (4, 5097845), (5, 4078276), (10, 2039138), (20, 1019569), (389, 52420), (778, 26210), (1556, 13105), (1945, 10484), (2621, 7780), (3890, 5242)]