19781986

素因数分解:

$2^1\times 7^2\times {\mathrm{97}}^1\times {\mathrm{2081}}^1$

素因数の和:2194

約数の個数: 24

約数和(自身を含む): 34890156

約数和(自身を除く): 15108170

約数列:

[1, 2, 7, 14, 49, 97, 98, 194, 679, 1358, 2081, 4162, 4753, 9506, 14567, 29134, 101969, 201857, 203938, 403714, 1412999, 2825998, 9890993, 19781986]

約数ペア:

[(1, 19781986), (2, 9890993), (7, 2825998), (14, 1412999), (49, 403714), (97, 203938), (98, 201857), (194, 101969), (679, 29134), (1358, 14567), (2081, 9506), (4162, 4753)]