21319280

素因数分解:

$2^4\times 5^1\times {\mathrm{266491}}^1$

素因数の和:266504

約数の個数: 20

約数和(自身を含む): 49567512

約数和(自身を除く): 28248232

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266491, 532982, 1065964, 1332455, 2131928, 2664910, 4263856, 5329820, 10659640, 21319280]

約数ペア:

[(1, 21319280), (2, 10659640), (4, 5329820), (5, 4263856), (8, 2664910), (10, 2131928), (16, 1332455), (20, 1065964), (40, 532982), (80, 266491)]