19999995

素因数分解:

$3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{1999}}^1$

素因数の和:2059

約数の個数: 32

約数和(自身を含む): 34560000

約数和(自身を除く): 14560005

約数列:

[1, 3, 5, 15, 23, 29, 69, 87, 115, 145, 345, 435, 667, 1999, 2001, 3335, 5997, 9995, 10005, 29985, 45977, 57971, 137931, 173913, 229885, 289855, 689655, 869565, 1333333, 3999999, 6666665, 19999995]

約数ペア:

[(1, 19999995), (3, 6666665), (5, 3999999), (15, 1333333), (23, 869565), (29, 689655), (69, 289855), (87, 229885), (115, 173913), (145, 137931), (345, 57971), (435, 45977), (667, 29985), (1999, 10005), (2001, 9995), (3335, 5997)]