20780990

素因数分解:

$2^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{29269}}^1$

素因数の和:29347

約数の個数: 16

約数和(自身を含む): 37933920

約数和(自身を除く): 17152930

約数列:

[1, 2, 5, 10, 71, 142, 355, 710, 29269, 58538, 146345, 292690, 2078099, 4156198, 10390495, 20780990]

約数ペア:

[(1, 20780990), (2, 10390495), (5, 4156198), (10, 2078099), (71, 292690), (142, 146345), (355, 58538), (710, 29269)]