21161680

素因数分解:

$2^4\times 5^1\times {\mathrm{83}}^1\times {\mathrm{3187}}^1$

素因数の和:3283

約数の個数: 40

約数和(自身を含む): 49809312

約数和(自身を除く): 28647632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 83, 166, 332, 415, 664, 830, 1328, 1660, 3187, 3320, 6374, 6640, 12748, 15935, 25496, 31870, 50992, 63740, 127480, 254960, 264521, 529042, 1058084, 1322605, 2116168, 2645210, 4232336, 5290420, 10580840, 21161680]

約数ペア:

[(1, 21161680), (2, 10580840), (4, 5290420), (5, 4232336), (8, 2645210), (10, 2116168), (16, 1322605), (20, 1058084), (40, 529042), (80, 264521), (83, 254960), (166, 127480), (332, 63740), (415, 50992), (664, 31870), (830, 25496), (1328, 15935), (1660, 12748), (3187, 6640), (3320, 6374)]