19940140

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{233}}^1\times {\mathrm{389}}^1$

素因数の和:642

約数の個数: 48

約数和(自身を含む): 45995040

約数和(自身を除く): 26054900

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 233, 389, 466, 778, 932, 1165, 1556, 1945, 2330, 2563, 3890, 4279, 4660, 5126, 7780, 8558, 10252, 12815, 17116, 21395, 25630, 42790, 51260, 85580, 90637, 181274, 362548, 453185, 906370, 997007, 1812740, 1994014, 3988028, 4985035, 9970070, 19940140]

約数ペア:

[(1, 19940140), (2, 9970070), (4, 4985035), (5, 3988028), (10, 1994014), (11, 1812740), (20, 997007), (22, 906370), (44, 453185), (55, 362548), (110, 181274), (220, 90637), (233, 85580), (389, 51260), (466, 42790), (778, 25630), (932, 21395), (1165, 17116), (1556, 12815), (1945, 10252), (2330, 8558), (2563, 7780), (3890, 5126), (4279, 4660)]