19998320

素因数分解:

$2^4\times 5^1\times {\mathrm{457}}^1\times {\mathrm{547}}^1$

素因数の和:1017

約数の個数: 40

約数和(自身を含む): 46683024

約数和(自身を除く): 26684704

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 457, 547, 914, 1094, 1828, 2188, 2285, 2735, 3656, 4376, 4570, 5470, 7312, 8752, 9140, 10940, 18280, 21880, 36560, 43760, 249979, 499958, 999916, 1249895, 1999832, 2499790, 3999664, 4999580, 9999160, 19998320]

約数ペア:

[(1, 19998320), (2, 9999160), (4, 4999580), (5, 3999664), (8, 2499790), (10, 1999832), (16, 1249895), (20, 999916), (40, 499958), (80, 249979), (457, 43760), (547, 36560), (914, 21880), (1094, 18280), (1828, 10940), (2188, 9140), (2285, 8752), (2735, 7312), (3656, 5470), (4376, 4570)]