19980920

素因数分解:

$2^3\times 5^1\times {\mathrm{499523}}^1$

素因数の和:499534

約数の個数: 16

約数和(自身を含む): 44957160

約数和(自身を除く): 24976240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499523, 999046, 1998092, 2497615, 3996184, 4995230, 9990460, 19980920]

約数ペア:

[(1, 19980920), (2, 9990460), (4, 4995230), (5, 3996184), (8, 2497615), (10, 1998092), (20, 999046), (40, 499523)]