19991745

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{281}}^1$

素因数の和:343

約数の個数: 64

約数和(自身を含む): 38983680

約数和(自身を除く): 18991935

約数列:

[1, 3, 5, 9, 15, 17, 27, 31, 45, 51, 85, 93, 135, 153, 155, 255, 279, 281, 459, 465, 527, 765, 837, 843, 1395, 1405, 1581, 2295, 2529, 2635, 4185, 4215, 4743, 4777, 7587, 7905, 8711, 12645, 14229, 14331, 23715, 23885, 26133, 37935, 42993, 43555, 71145, 71655, 78399, 128979, 130665, 148087, 214965, 235197, 391995, 444261, 644895, 740435, 1175985, 1332783, 2221305, 3998349, 6663915, 19991745]

約数ペア:

[(1, 19991745), (3, 6663915), (5, 3998349), (9, 2221305), (15, 1332783), (17, 1175985), (27, 740435), (31, 644895), (45, 444261), (51, 391995), (85, 235197), (93, 214965), (135, 148087), (153, 130665), (155, 128979), (255, 78399), (279, 71655), (281, 71145), (459, 43555), (465, 42993), (527, 37935), (765, 26133), (837, 23885), (843, 23715), (1395, 14331), (1405, 14229), (1581, 12645), (2295, 8711), (2529, 7905), (2635, 7587), (4185, 4777), (4215, 4743)]