21307990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{1997}}^1$

素因数の和:2112

約数の個数: 32

約数和(自身を含む): 42293664

約数和(自身を除く): 20985674

約数列:

[1, 2, 5, 10, 11, 22, 55, 97, 110, 194, 485, 970, 1067, 1997, 2134, 3994, 5335, 9985, 10670, 19970, 21967, 43934, 109835, 193709, 219670, 387418, 968545, 1937090, 2130799, 4261598, 10653995, 21307990]

約数ペア:

[(1, 21307990), (2, 10653995), (5, 4261598), (10, 2130799), (11, 1937090), (22, 968545), (55, 387418), (97, 219670), (110, 193709), (194, 109835), (485, 43934), (970, 21967), (1067, 19970), (1997, 10670), (2134, 9985), (3994, 5335)]