19979985

素因数分解:

$3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{1997}}^1$

素因数の和:2057

約数の個数: 32

約数和(自身を含む): 34525440

約数和(自身を除く): 14545455

約数列:

[1, 3, 5, 15, 23, 29, 69, 87, 115, 145, 345, 435, 667, 1997, 2001, 3335, 5991, 9985, 10005, 29955, 45931, 57913, 137793, 173739, 229655, 289565, 688965, 868695, 1331999, 3995997, 6659995, 19979985]

約数ペア:

[(1, 19979985), (3, 6659995), (5, 3995997), (15, 1331999), (23, 868695), (29, 688965), (69, 289565), (87, 229655), (115, 173739), (145, 137793), (345, 57913), (435, 45931), (667, 29955), (1997, 10005), (2001, 9985), (3335, 5991)]