21255840

素因数分解:

$2^5\times 3^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{509}}^1$

素因数の和:559

約数の個数: 144

約数和(自身を含む): 75184200

約数和(自身を除く): 53928360

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, 509, 522, 580, 696, 720, 870, 928, 1018, 1044, 1160, 1305, 1392, 1440, 1527, 1740, 2036, 2088, 2320, 2545, 2610, 2784, 3054, 3480, 4072, 4176, 4581, 4640, 5090, 5220, 6108, 6960, 7635, 8144, 8352, 9162, 10180, 10440, 12216, 13920, 14761, 15270, 16288, 18324, 20360, 20880, 22905, 24432, 29522, 30540, 36648, 40720, 41760, 44283, 45810, 48864, 59044, 61080, 73296, 73805, 81440, 88566, 91620, 118088, 122160, 132849, 146592, 147610, 177132, 183240, 221415, 236176, 244320, 265698, 295220, 354264, 366480, 442830, 472352, 531396, 590440, 664245, 708528, 732960, 885660, 1062792, 1180880, 1328490, 1417056, 1771320, 2125584, 2361760, 2656980, 3542640, 4251168, 5313960, 7085280, 10627920, 21255840]

約数ペア:

[(1, 21255840), (2, 10627920), (3, 7085280), (4, 5313960), (5, 4251168), (6, 3542640), (8, 2656980), (9, 2361760), (10, 2125584), (12, 1771320), (15, 1417056), (16, 1328490), (18, 1180880), (20, 1062792), (24, 885660), (29, 732960), (30, 708528), (32, 664245), (36, 590440), (40, 531396), (45, 472352), (48, 442830), (58, 366480), (60, 354264), (72, 295220), (80, 265698), (87, 244320), (90, 236176), (96, 221415), (116, 183240), (120, 177132), (144, 147610), (145, 146592), (160, 132849), (174, 122160), (180, 118088), (232, 91620), (240, 88566), (261, 81440), (288, 73805), (290, 73296), (348, 61080), (360, 59044), (435, 48864), (464, 45810), (480, 44283), (509, 41760), (522, 40720), (580, 36648), (696, 30540), (720, 29522), (870, 24432), (928, 22905), (1018, 20880), (1044, 20360), (1160, 18324), (1305, 16288), (1392, 15270), (1440, 14761), (1527, 13920), (1740, 12216), (2036, 10440), (2088, 10180), (2320, 9162), (2545, 8352), (2610, 8144), (2784, 7635), (3054, 6960), (3480, 6108), (4072, 5220), (4176, 5090), (4581, 4640)]