21205660

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{167}}^1\times {\mathrm{907}}^1$

素因数の和:1090

約数の個数: 48

約数和(自身を含む): 51254784

約数和(自身を除く): 30049124

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 167, 334, 668, 835, 907, 1169, 1670, 1814, 2338, 3340, 3628, 4535, 4676, 5845, 6349, 9070, 11690, 12698, 18140, 23380, 25396, 31745, 63490, 126980, 151469, 302938, 605876, 757345, 1060283, 1514690, 2120566, 3029380, 4241132, 5301415, 10602830, 21205660]

約数ペア:

[(1, 21205660), (2, 10602830), (4, 5301415), (5, 4241132), (7, 3029380), (10, 2120566), (14, 1514690), (20, 1060283), (28, 757345), (35, 605876), (70, 302938), (140, 151469), (167, 126980), (334, 63490), (668, 31745), (835, 25396), (907, 23380), (1169, 18140), (1670, 12698), (1814, 11690), (2338, 9070), (3340, 6349), (3628, 5845), (4535, 4676)]