19691991

素因数分解:

$3^5\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{139}}^1$

素因数の和:218

約数の個数: 48

約数和(自身を含む): 33022080

約数和(自身を除く): 13330089

約数列:

[1, 3, 9, 11, 27, 33, 53, 81, 99, 139, 159, 243, 297, 417, 477, 583, 891, 1251, 1431, 1529, 1749, 2673, 3753, 4293, 4587, 5247, 7367, 11259, 12879, 13761, 15741, 22101, 33777, 41283, 47223, 66303, 81037, 123849, 141669, 198909, 243111, 371547, 596727, 729333, 1790181, 2187999, 6563997, 19691991]

約数ペア:

[(1, 19691991), (3, 6563997), (9, 2187999), (11, 1790181), (27, 729333), (33, 596727), (53, 371547), (81, 243111), (99, 198909), (139, 141669), (159, 123849), (243, 81037), (297, 66303), (417, 47223), (477, 41283), (583, 33777), (891, 22101), (1251, 15741), (1431, 13761), (1529, 12879), (1749, 11259), (2673, 7367), (3753, 5247), (4293, 4587)]