21131280

素因数分解:

$2^4\times 3^5\times 5^1\times {\mathrm{1087}}^1$

素因数の和:1115

約数の個数: 120

約数和(自身を含む): 73661952

約数和(自身を除く): 52530672

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 27, 30, 36, 40, 45, 48, 54, 60, 72, 80, 81, 90, 108, 120, 135, 144, 162, 180, 216, 240, 243, 270, 324, 360, 405, 432, 486, 540, 648, 720, 810, 972, 1080, 1087, 1215, 1296, 1620, 1944, 2160, 2174, 2430, 3240, 3261, 3888, 4348, 4860, 5435, 6480, 6522, 8696, 9720, 9783, 10870, 13044, 16305, 17392, 19440, 19566, 21740, 26088, 29349, 32610, 39132, 43480, 48915, 52176, 58698, 65220, 78264, 86960, 88047, 97830, 117396, 130440, 146745, 156528, 176094, 195660, 234792, 260880, 264141, 293490, 352188, 391320, 440235, 469584, 528282, 586980, 704376, 782640, 880470, 1056564, 1173960, 1320705, 1408752, 1760940, 2113128, 2347920, 2641410, 3521880, 4226256, 5282820, 7043760, 10565640, 21131280]

約数ペア:

[(1, 21131280), (2, 10565640), (3, 7043760), (4, 5282820), (5, 4226256), (6, 3521880), (8, 2641410), (9, 2347920), (10, 2113128), (12, 1760940), (15, 1408752), (16, 1320705), (18, 1173960), (20, 1056564), (24, 880470), (27, 782640), (30, 704376), (36, 586980), (40, 528282), (45, 469584), (48, 440235), (54, 391320), (60, 352188), (72, 293490), (80, 264141), (81, 260880), (90, 234792), (108, 195660), (120, 176094), (135, 156528), (144, 146745), (162, 130440), (180, 117396), (216, 97830), (240, 88047), (243, 86960), (270, 78264), (324, 65220), (360, 58698), (405, 52176), (432, 48915), (486, 43480), (540, 39132), (648, 32610), (720, 29349), (810, 26088), (972, 21740), (1080, 19566), (1087, 19440), (1215, 17392), (1296, 16305), (1620, 13044), (1944, 10870), (2160, 9783), (2174, 9720), (2430, 8696), (3240, 6522), (3261, 6480), (3888, 5435), (4348, 4860)]