20726320

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:214

約数の個数: 80

約数和(自身を含む): 50621760

約数和(自身を除く): 29895440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 71, 80, 82, 89, 142, 164, 178, 205, 284, 328, 355, 356, 410, 445, 568, 656, 710, 712, 820, 890, 1136, 1420, 1424, 1640, 1780, 2840, 2911, 3280, 3560, 3649, 5680, 5822, 6319, 7120, 7298, 11644, 12638, 14555, 14596, 18245, 23288, 25276, 29110, 29192, 31595, 36490, 46576, 50552, 58220, 58384, 63190, 72980, 101104, 116440, 126380, 145960, 232880, 252760, 259079, 291920, 505520, 518158, 1036316, 1295395, 2072632, 2590790, 4145264, 5181580, 10363160, 20726320]

約数ペア:

[(1, 20726320), (2, 10363160), (4, 5181580), (5, 4145264), (8, 2590790), (10, 2072632), (16, 1295395), (20, 1036316), (40, 518158), (41, 505520), (71, 291920), (80, 259079), (82, 252760), (89, 232880), (142, 145960), (164, 126380), (178, 116440), (205, 101104), (284, 72980), (328, 63190), (355, 58384), (356, 58220), (410, 50552), (445, 46576), (568, 36490), (656, 31595), (710, 29192), (712, 29110), (820, 25276), (890, 23288), (1136, 18245), (1420, 14596), (1424, 14555), (1640, 12638), (1780, 11644), (2840, 7298), (2911, 7120), (3280, 6319), (3560, 5822), (3649, 5680)]