19718020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{1109}}^1$

素因数の和:1252

約数の個数: 48

約数和(自身を含む): 47738880

約数和(自身を除く): 28020860

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 127, 140, 254, 508, 635, 889, 1109, 1270, 1778, 2218, 2540, 3556, 4436, 4445, 5545, 7763, 8890, 11090, 15526, 17780, 22180, 31052, 38815, 77630, 140843, 155260, 281686, 563372, 704215, 985901, 1408430, 1971802, 2816860, 3943604, 4929505, 9859010, 19718020]

約数ペア:

[(1, 19718020), (2, 9859010), (4, 4929505), (5, 3943604), (7, 2816860), (10, 1971802), (14, 1408430), (20, 985901), (28, 704215), (35, 563372), (70, 281686), (127, 155260), (140, 140843), (254, 77630), (508, 38815), (635, 31052), (889, 22180), (1109, 17780), (1270, 15526), (1778, 11090), (2218, 8890), (2540, 7763), (3556, 5545), (4436, 4445)]