21399380

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{149}}^1\times {\mathrm{167}}^1$

素因数の和:368

約数の個数: 48

約数和(自身を含む): 46569600

約数和(自身を除く): 25170220

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 149, 167, 172, 215, 298, 334, 430, 596, 668, 745, 835, 860, 1490, 1670, 2980, 3340, 6407, 7181, 12814, 14362, 24883, 25628, 28724, 32035, 35905, 49766, 64070, 71810, 99532, 124415, 128140, 143620, 248830, 497660, 1069969, 2139938, 4279876, 5349845, 10699690, 21399380]

約数ペア:

[(1, 21399380), (2, 10699690), (4, 5349845), (5, 4279876), (10, 2139938), (20, 1069969), (43, 497660), (86, 248830), (149, 143620), (167, 128140), (172, 124415), (215, 99532), (298, 71810), (334, 64070), (430, 49766), (596, 35905), (668, 32035), (745, 28724), (835, 25628), (860, 24883), (1490, 14362), (1670, 12814), (2980, 7181), (3340, 6407)]