21387280

素因数分解:

$2^4\times 5^1\times {\mathrm{267341}}^1$

素因数の和:267354

約数の個数: 20

約数和(自身を含む): 49725612

約数和(自身を除く): 28338332

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267341, 534682, 1069364, 1336705, 2138728, 2673410, 4277456, 5346820, 10693640, 21387280]

約数ペア:

[(1, 21387280), (2, 10693640), (4, 5346820), (5, 4277456), (8, 2673410), (10, 2138728), (16, 1336705), (20, 1069364), (40, 534682), (80, 267341)]