18980505

素因数分解:

$3^2\times 5^1\times {\mathrm{211}}^1\times {\mathrm{1999}}^1$

素因数の和:2221

約数の個数: 24

約数和(自身を含む): 33072000

約数和(自身を除く): 14091495

約数列:

[1, 3, 5, 9, 15, 45, 211, 633, 1055, 1899, 1999, 3165, 5997, 9495, 9995, 17991, 29985, 89955, 421789, 1265367, 2108945, 3796101, 6326835, 18980505]

約数ペア:

[(1, 18980505), (3, 6326835), (5, 3796101), (9, 2108945), (15, 1265367), (45, 421789), (211, 89955), (633, 29985), (1055, 17991), (1899, 9995), (1999, 9495), (3165, 5997)]