19971820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{3947}}^1$

素因数の和:3990

約数の個数: 48

約数和(自身を含む): 47755008

約数和(自身を除く): 27783188

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 23, 44, 46, 55, 92, 110, 115, 220, 230, 253, 460, 506, 1012, 1265, 2530, 3947, 5060, 7894, 15788, 19735, 39470, 43417, 78940, 86834, 90781, 173668, 181562, 217085, 363124, 434170, 453905, 868340, 907810, 998591, 1815620, 1997182, 3994364, 4992955, 9985910, 19971820]

約数ペア:

[(1, 19971820), (2, 9985910), (4, 4992955), (5, 3994364), (10, 1997182), (11, 1815620), (20, 998591), (22, 907810), (23, 868340), (44, 453905), (46, 434170), (55, 363124), (92, 217085), (110, 181562), (115, 173668), (220, 90781), (230, 86834), (253, 78940), (460, 43417), (506, 39470), (1012, 19735), (1265, 15788), (2530, 7894), (3947, 5060)]