21128420

素因数分解:

$2^2\times 5^1\times {\mathrm{191}}^1\times {\mathrm{5531}}^1$

素因数の和:5731

約数の個数: 24

約数和(自身を含む): 44610048

約数和(自身を除く): 23481628

約数列:

[1, 2, 4, 5, 10, 20, 191, 382, 764, 955, 1910, 3820, 5531, 11062, 22124, 27655, 55310, 110620, 1056421, 2112842, 4225684, 5282105, 10564210, 21128420]

約数ペア:

[(1, 21128420), (2, 10564210), (4, 5282105), (5, 4225684), (10, 2112842), (20, 1056421), (191, 110620), (382, 55310), (764, 27655), (955, 22124), (1910, 11062), (3820, 5531)]