21398690

素因数分解:

$2^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{30139}}^1$

素因数の和:30217

約数の個数: 16

約数和(自身を含む): 39061440

約数和(自身を除く): 17662750

約数列:

[1, 2, 5, 10, 71, 142, 355, 710, 30139, 60278, 150695, 301390, 2139869, 4279738, 10699345, 21398690]

約数ペア:

[(1, 21398690), (2, 10699345), (5, 4279738), (10, 2139869), (71, 301390), (142, 150695), (355, 60278), (710, 30139)]