21400880

素因数分解:

$2^4\times 5^1\times {\mathrm{267511}}^1$

素因数の和:267524

約数の個数: 20

約数和(自身を含む): 49757232

約数和(自身を除く): 28356352

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267511, 535022, 1070044, 1337555, 2140088, 2675110, 4280176, 5350220, 10700440, 21400880]

約数ペア:

[(1, 21400880), (2, 10700440), (4, 5350220), (5, 4280176), (8, 2675110), (10, 2140088), (16, 1337555), (20, 1070044), (40, 535022), (80, 267511)]