21397520

素因数分解:

$2^4\times 5^1\times {\mathrm{267469}}^1$

素因数の和:267482

約数の個数: 20

約数和(自身を含む): 49749420

約数和(自身を除く): 28351900

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267469, 534938, 1069876, 1337345, 2139752, 2674690, 4279504, 5349380, 10698760, 21397520]

約数ペア:

[(1, 21397520), (2, 10698760), (4, 5349380), (5, 4279504), (8, 2674690), (10, 2139752), (16, 1337345), (20, 1069876), (40, 534938), (80, 267469)]