21005280

素因数分解:

$2^5\times 3^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{503}}^1$

素因数の和:553

約数の個数: 144

約数和(自身を含む): 74299680

約数和(自身を除く): 53294400

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 29, 30, 32, 36, 40, 45, 48, 58, 60, 72, 80, 87, 90, 96, 116, 120, 144, 145, 160, 174, 180, 232, 240, 261, 288, 290, 348, 360, 435, 464, 480, 503, 522, 580, 696, 720, 870, 928, 1006, 1044, 1160, 1305, 1392, 1440, 1509, 1740, 2012, 2088, 2320, 2515, 2610, 2784, 3018, 3480, 4024, 4176, 4527, 4640, 5030, 5220, 6036, 6960, 7545, 8048, 8352, 9054, 10060, 10440, 12072, 13920, 14587, 15090, 16096, 18108, 20120, 20880, 22635, 24144, 29174, 30180, 36216, 40240, 41760, 43761, 45270, 48288, 58348, 60360, 72432, 72935, 80480, 87522, 90540, 116696, 120720, 131283, 144864, 145870, 175044, 181080, 218805, 233392, 241440, 262566, 291740, 350088, 362160, 437610, 466784, 525132, 583480, 656415, 700176, 724320, 875220, 1050264, 1166960, 1312830, 1400352, 1750440, 2100528, 2333920, 2625660, 3500880, 4201056, 5251320, 7001760, 10502640, 21005280]

約数ペア:

[(1, 21005280), (2, 10502640), (3, 7001760), (4, 5251320), (5, 4201056), (6, 3500880), (8, 2625660), (9, 2333920), (10, 2100528), (12, 1750440), (15, 1400352), (16, 1312830), (18, 1166960), (20, 1050264), (24, 875220), (29, 724320), (30, 700176), (32, 656415), (36, 583480), (40, 525132), (45, 466784), (48, 437610), (58, 362160), (60, 350088), (72, 291740), (80, 262566), (87, 241440), (90, 233392), (96, 218805), (116, 181080), (120, 175044), (144, 145870), (145, 144864), (160, 131283), (174, 120720), (180, 116696), (232, 90540), (240, 87522), (261, 80480), (288, 72935), (290, 72432), (348, 60360), (360, 58348), (435, 48288), (464, 45270), (480, 43761), (503, 41760), (522, 40240), (580, 36216), (696, 30180), (720, 29174), (870, 24144), (928, 22635), (1006, 20880), (1044, 20120), (1160, 18108), (1305, 16096), (1392, 15090), (1440, 14587), (1509, 13920), (1740, 12072), (2012, 10440), (2088, 10060), (2320, 9054), (2515, 8352), (2610, 8048), (2784, 7545), (3018, 6960), (3480, 6036), (4024, 5220), (4176, 5030), (4527, 4640)]