21375620

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{2503}}^1$

素因数の和:2580

約数の個数: 48

約数和(自身を含む): 52163328

約数和(自身を除く): 30787708

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 61, 70, 122, 140, 244, 305, 427, 610, 854, 1220, 1708, 2135, 2503, 4270, 5006, 8540, 10012, 12515, 17521, 25030, 35042, 50060, 70084, 87605, 152683, 175210, 305366, 350420, 610732, 763415, 1068781, 1526830, 2137562, 3053660, 4275124, 5343905, 10687810, 21375620]

約数ペア:

[(1, 21375620), (2, 10687810), (4, 5343905), (5, 4275124), (7, 3053660), (10, 2137562), (14, 1526830), (20, 1068781), (28, 763415), (35, 610732), (61, 350420), (70, 305366), (122, 175210), (140, 152683), (244, 87605), (305, 70084), (427, 50060), (610, 35042), (854, 25030), (1220, 17521), (1708, 12515), (2135, 10012), (2503, 8540), (4270, 5006)]