19992987

素因数分解:

$3^4\times 7^1\times {\mathrm{37}}^1\times {\mathrm{953}}^1$

素因数の和:1009

約数の個数: 40

約数和(自身を含む): 35091936

約数和(自身を除く): 15098949

約数列:

[1, 3, 7, 9, 21, 27, 37, 63, 81, 111, 189, 259, 333, 567, 777, 953, 999, 2331, 2859, 2997, 6671, 6993, 8577, 20013, 20979, 25731, 35261, 60039, 77193, 105783, 180117, 246827, 317349, 540351, 740481, 952047, 2221443, 2856141, 6664329, 19992987]

約数ペア:

[(1, 19992987), (3, 6664329), (7, 2856141), (9, 2221443), (21, 952047), (27, 740481), (37, 540351), (63, 317349), (81, 246827), (111, 180117), (189, 105783), (259, 77193), (333, 60039), (567, 35261), (777, 25731), (953, 20979), (999, 20013), (2331, 8577), (2859, 6993), (2997, 6671)]