19997840

素因数分解:

$2^4\times 5^1\times {\mathrm{249973}}^1$

素因数の和:249986

約数の個数: 20

約数和(自身を含む): 46495164

約数和(自身を除く): 26497324

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249973, 499946, 999892, 1249865, 1999784, 2499730, 3999568, 4999460, 9998920, 19997840]

約数ペア:

[(1, 19997840), (2, 9998920), (4, 4999460), (5, 3999568), (8, 2499730), (10, 1999784), (16, 1249865), (20, 999892), (40, 499946), (80, 249973)]