21381280

素因数分解:

$2^5\times 5^1\times {\mathrm{133633}}^1$

素因数の和:133648

約数の個数: 24

約数和(自身を含む): 50513652

約数和(自身を除く): 29132372

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 133633, 267266, 534532, 668165, 1069064, 1336330, 2138128, 2672660, 4276256, 5345320, 10690640, 21381280]

約数ペア:

[(1, 21381280), (2, 10690640), (4, 5345320), (5, 4276256), (8, 2672660), (10, 2138128), (16, 1336330), (20, 1069064), (32, 668165), (40, 534532), (80, 267266), (160, 133633)]