21319120

素因数分解:

$2^4\times 5^1\times {\mathrm{266489}}^1$

素因数の和:266502

約数の個数: 20

約数和(自身を含む): 49567140

約数和(自身を除く): 28248020

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266489, 532978, 1065956, 1332445, 2131912, 2664890, 4263824, 5329780, 10659560, 21319120]

約数ペア:

[(1, 21319120), (2, 10659560), (4, 5329780), (5, 4263824), (8, 2664890), (10, 2131912), (16, 1332445), (20, 1065956), (40, 532978), (80, 266489)]