20405955

素因数分解:

$3^1\times 5^1\times {\mathrm{821}}^1\times {\mathrm{1657}}^1$

素因数の和:2486

約数の個数: 16

約数和(自身を含む): 32709024

約数和(自身を除く): 12303069

約数列:

[1, 3, 5, 15, 821, 1657, 2463, 4105, 4971, 8285, 12315, 24855, 1360397, 4081191, 6801985, 20405955]

約数ペア:

[(1, 20405955), (3, 6801985), (5, 4081191), (15, 1360397), (821, 24855), (1657, 12315), (2463, 8285), (4105, 4971)]