19987989

素因数分解:

$3^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{1427}}^1$

素因数の和:1489

約数の個数: 32

約数和(自身を含む): 32901120

約数和(自身を除く): 12913131

約数列:

[1, 3, 7, 21, 23, 29, 69, 87, 161, 203, 483, 609, 667, 1427, 2001, 4281, 4669, 9989, 14007, 29967, 32821, 41383, 98463, 124149, 229747, 289681, 689241, 869043, 951809, 2855427, 6662663, 19987989]

約数ペア:

[(1, 19987989), (3, 6662663), (7, 2855427), (21, 951809), (23, 869043), (29, 689241), (69, 289681), (87, 229747), (161, 124149), (203, 98463), (483, 41383), (609, 32821), (667, 29967), (1427, 14007), (2001, 9989), (4281, 4669)]