81959980

素因数分解:

$2^2\times 5^1\times {\mathrm{1231}}^1\times {\mathrm{3329}}^1$

素因数の和:4569

約数の個数: 24

約数和(自身を含む): 172307520

約数和(自身を除く): 90347540

約数列:

[1, 2, 4, 5, 10, 20, 1231, 2462, 3329, 4924, 6155, 6658, 12310, 13316, 16645, 24620, 33290, 66580, 4097999, 8195998, 16391996, 20489995, 40979990, 81959980]

約数ペア:

[(1, 81959980), (2, 40979990), (4, 20489995), (5, 16391996), (10, 8195998), (20, 4097999), (1231, 66580), (2462, 33290), (3329, 24620), (4924, 16645), (6155, 13316), (6658, 12310)]