21005990

素因数分解:

$2^1\times 5^1\times {\mathrm{631}}^1\times {\mathrm{3329}}^1$

素因数の和:3967

約数の個数: 16

約数和(自身を含む): 37882080

約数和(自身を除く): 16876090

約数列:

[1, 2, 5, 10, 631, 1262, 3155, 3329, 6310, 6658, 16645, 33290, 2100599, 4201198, 10502995, 21005990]

約数ペア:

[(1, 21005990), (2, 10502995), (5, 4201198), (10, 2100599), (631, 33290), (1262, 16645), (3155, 6658), (3329, 6310)]