19778320

素因数分解:

$2^4\times 5^1\times {\mathrm{247229}}^1$

素因数の和:247242

約数の個数: 20

約数和(自身を含む): 45984780

約数和(自身を除く): 26206460

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247229, 494458, 988916, 1236145, 1977832, 2472290, 3955664, 4944580, 9889160, 19778320]

約数ペア:

[(1, 19778320), (2, 9889160), (4, 4944580), (5, 3955664), (8, 2472290), (10, 1977832), (16, 1236145), (20, 988916), (40, 494458), (80, 247229)]