21039620

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{3067}}^1$

素因数の和:3097

約数の個数: 48

約数和(自身を含む): 51542400

約数和(自身を除く): 30502780

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 343, 490, 686, 980, 1372, 1715, 3067, 3430, 6134, 6860, 12268, 15335, 21469, 30670, 42938, 61340, 85876, 107345, 150283, 214690, 300566, 429380, 601132, 751415, 1051981, 1502830, 2103962, 3005660, 4207924, 5259905, 10519810, 21039620]

約数ペア:

[(1, 21039620), (2, 10519810), (4, 5259905), (5, 4207924), (7, 3005660), (10, 2103962), (14, 1502830), (20, 1051981), (28, 751415), (35, 601132), (49, 429380), (70, 300566), (98, 214690), (140, 150283), (196, 107345), (245, 85876), (343, 61340), (490, 42938), (686, 30670), (980, 21469), (1372, 15335), (1715, 12268), (3067, 6860), (3430, 6134)]