21285860

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{467}}^1$

素因数の和:572

約数の個数: 48

約数和(自身を含む): 46702656

約数和(自身を除く): 25416796

約数列:

[1, 2, 4, 5, 10, 20, 43, 53, 86, 106, 172, 212, 215, 265, 430, 467, 530, 860, 934, 1060, 1868, 2279, 2335, 4558, 4670, 9116, 9340, 11395, 20081, 22790, 24751, 40162, 45580, 49502, 80324, 99004, 100405, 123755, 200810, 247510, 401620, 495020, 1064293, 2128586, 4257172, 5321465, 10642930, 21285860]

約数ペア:

[(1, 21285860), (2, 10642930), (4, 5321465), (5, 4257172), (10, 2128586), (20, 1064293), (43, 495020), (53, 401620), (86, 247510), (106, 200810), (172, 123755), (212, 100405), (215, 99004), (265, 80324), (430, 49502), (467, 45580), (530, 40162), (860, 24751), (934, 22790), (1060, 20081), (1868, 11395), (2279, 9340), (2335, 9116), (4558, 4670)]