19995440

素因数分解:

$2^4\times 5^1\times {\mathrm{249943}}^1$

素因数の和:249956

約数の個数: 20

約数和(自身を含む): 46489584

約数和(自身を除く): 26494144

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249943, 499886, 999772, 1249715, 1999544, 2499430, 3999088, 4998860, 9997720, 19995440]

約数ペア:

[(1, 19995440), (2, 9997720), (4, 4998860), (5, 3999088), (8, 2499430), (10, 1999544), (16, 1249715), (20, 999772), (40, 499886), (80, 249943)]