21686620

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{151}}^1\times {\mathrm{167}}^1$

素因数の和:370

約数の個数: 48

約数和(自身を含む): 47190528

約数和(自身を除く): 25503908

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 151, 167, 172, 215, 302, 334, 430, 604, 668, 755, 835, 860, 1510, 1670, 3020, 3340, 6493, 7181, 12986, 14362, 25217, 25972, 28724, 32465, 35905, 50434, 64930, 71810, 100868, 126085, 129860, 143620, 252170, 504340, 1084331, 2168662, 4337324, 5421655, 10843310, 21686620]

約数ペア:

[(1, 21686620), (2, 10843310), (4, 5421655), (5, 4337324), (10, 2168662), (20, 1084331), (43, 504340), (86, 252170), (151, 143620), (167, 129860), (172, 126085), (215, 100868), (302, 71810), (334, 64930), (430, 50434), (604, 35905), (668, 32465), (755, 28724), (835, 25972), (860, 25217), (1510, 14362), (1670, 12986), (3020, 7181), (3340, 6493)]