19997505

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{569}}^1$

素因数の和:662

約数の個数: 48

約数和(自身を含む): 38413440

約数和(自身を除く): 18415935

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 55, 71, 99, 165, 213, 355, 495, 569, 639, 781, 1065, 1707, 2343, 2845, 3195, 3905, 5121, 6259, 7029, 8535, 11715, 18777, 25605, 31295, 35145, 40399, 56331, 93885, 121197, 201995, 281655, 363591, 444389, 605985, 1333167, 1817955, 2221945, 3999501, 6665835, 19997505]

約数ペア:

[(1, 19997505), (3, 6665835), (5, 3999501), (9, 2221945), (11, 1817955), (15, 1333167), (33, 605985), (45, 444389), (55, 363591), (71, 281655), (99, 201995), (165, 121197), (213, 93885), (355, 56331), (495, 40399), (569, 35145), (639, 31295), (781, 25605), (1065, 18777), (1707, 11715), (2343, 8535), (2845, 7029), (3195, 6259), (3905, 5121)]