19980640

素因数分解:

$2^5\times 5^1\times {\mathrm{47}}^1\times {\mathrm{2657}}^1$

素因数の和:2719

約数の個数: 48

約数和(自身を含む): 48226752

約数和(自身を除く): 28246112

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 47, 80, 94, 160, 188, 235, 376, 470, 752, 940, 1504, 1880, 2657, 3760, 5314, 7520, 10628, 13285, 21256, 26570, 42512, 53140, 85024, 106280, 124879, 212560, 249758, 425120, 499516, 624395, 999032, 1248790, 1998064, 2497580, 3996128, 4995160, 9990320, 19980640]

約数ペア:

[(1, 19980640), (2, 9990320), (4, 4995160), (5, 3996128), (8, 2497580), (10, 1998064), (16, 1248790), (20, 999032), (32, 624395), (40, 499516), (47, 425120), (80, 249758), (94, 212560), (160, 124879), (188, 106280), (235, 85024), (376, 53140), (470, 42512), (752, 26570), (940, 21256), (1504, 13285), (1880, 10628), (2657, 7520), (3760, 5314)]