21269960

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{79}}^1\times {\mathrm{127}}^1$

素因数の和:270

約数の個数: 64

約数和(自身を含む): 49766400

約数和(自身を除く): 28496440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 79, 106, 127, 158, 212, 254, 265, 316, 395, 424, 508, 530, 632, 635, 790, 1016, 1060, 1270, 1580, 2120, 2540, 3160, 4187, 5080, 6731, 8374, 10033, 13462, 16748, 20066, 20935, 26924, 33496, 33655, 40132, 41870, 50165, 53848, 67310, 80264, 83740, 100330, 134620, 167480, 200660, 269240, 401320, 531749, 1063498, 2126996, 2658745, 4253992, 5317490, 10634980, 21269960]

約数ペア:

[(1, 21269960), (2, 10634980), (4, 5317490), (5, 4253992), (8, 2658745), (10, 2126996), (20, 1063498), (40, 531749), (53, 401320), (79, 269240), (106, 200660), (127, 167480), (158, 134620), (212, 100330), (254, 83740), (265, 80264), (316, 67310), (395, 53848), (424, 50165), (508, 41870), (530, 40132), (632, 33655), (635, 33496), (790, 26924), (1016, 20935), (1060, 20066), (1270, 16748), (1580, 13462), (2120, 10033), (2540, 8374), (3160, 6731), (4187, 5080)]