9988990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{1279}}^1$

素因数の和:1368

約数の個数: 32

約数和(自身を含む): 19906560

約数和(自身を除く): 9917570

約数列:

[1, 2, 5, 10, 11, 22, 55, 71, 110, 142, 355, 710, 781, 1279, 1562, 2558, 3905, 6395, 7810, 12790, 14069, 28138, 70345, 90809, 140690, 181618, 454045, 908090, 998899, 1997798, 4994495, 9988990]

約数ペア:

[(1, 9988990), (2, 4994495), (5, 1997798), (10, 998899), (11, 908090), (22, 454045), (55, 181618), (71, 140690), (110, 90809), (142, 70345), (355, 28138), (710, 14069), (781, 12790), (1279, 7810), (1562, 6395), (2558, 3905)]