21688180

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{26449}}^1$

素因数の和:26499

約数の個数: 24

約数和(自身を含む): 46657800

約数和(自身を除く): 24969620

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 26449, 52898, 105796, 132245, 264490, 528980, 1084409, 2168818, 4337636, 5422045, 10844090, 21688180]

約数ペア:

[(1, 21688180), (2, 10844090), (4, 5422045), (5, 4337636), (10, 2168818), (20, 1084409), (41, 528980), (82, 264490), (164, 132245), (205, 105796), (410, 52898), (820, 26449)]