19720660

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{997}}^1$

素因数の和:1072

約数の個数: 48

約数和(自身を含む): 44263296

約数和(自身を除く): 24542636

約数列:

[1, 2, 4, 5, 10, 20, 23, 43, 46, 86, 92, 115, 172, 215, 230, 430, 460, 860, 989, 997, 1978, 1994, 3956, 3988, 4945, 4985, 9890, 9970, 19780, 19940, 22931, 42871, 45862, 85742, 91724, 114655, 171484, 214355, 229310, 428710, 458620, 857420, 986033, 1972066, 3944132, 4930165, 9860330, 19720660]

約数ペア:

[(1, 19720660), (2, 9860330), (4, 4930165), (5, 3944132), (10, 1972066), (20, 986033), (23, 857420), (43, 458620), (46, 428710), (86, 229310), (92, 214355), (115, 171484), (172, 114655), (215, 91724), (230, 85742), (430, 45862), (460, 42871), (860, 22931), (989, 19940), (997, 19780), (1978, 9970), (1994, 9890), (3956, 4985), (3988, 4945)]