21657321

素因数分解:

$3^3\times 7^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{163}}^1$

素因数の和:235

約数の個数: 64

約数和(自身を含む): 39884800

約数和(自身を除く): 18227479

約数列:

[1, 3, 7, 9, 19, 21, 27, 37, 57, 63, 111, 133, 163, 171, 189, 259, 333, 399, 489, 513, 703, 777, 999, 1141, 1197, 1467, 2109, 2331, 3097, 3423, 3591, 4401, 4921, 6031, 6327, 6993, 9291, 10269, 14763, 18093, 18981, 21679, 27873, 30807, 42217, 44289, 54279, 65037, 83619, 114589, 126651, 132867, 162837, 195111, 343767, 379953, 585333, 802123, 1031301, 1139859, 2406369, 3093903, 7219107, 21657321]

約数ペア:

[(1, 21657321), (3, 7219107), (7, 3093903), (9, 2406369), (19, 1139859), (21, 1031301), (27, 802123), (37, 585333), (57, 379953), (63, 343767), (111, 195111), (133, 162837), (163, 132867), (171, 126651), (189, 114589), (259, 83619), (333, 65037), (399, 54279), (489, 44289), (513, 42217), (703, 30807), (777, 27873), (999, 21679), (1141, 18981), (1197, 18093), (1467, 14763), (2109, 10269), (2331, 9291), (3097, 6993), (3423, 6327), (3591, 6031), (4401, 4921)]