21517720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{67}}^1$

素因数の和:153

約数の個数: 128

約数和(自身を含む): 59535360

約数和(自身を除く): 38017640

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 31, 35, 37, 40, 56, 62, 67, 70, 74, 124, 134, 140, 148, 155, 185, 217, 248, 259, 268, 280, 296, 310, 335, 370, 434, 469, 518, 536, 620, 670, 740, 868, 938, 1036, 1085, 1147, 1240, 1295, 1340, 1480, 1736, 1876, 2072, 2077, 2170, 2294, 2345, 2479, 2590, 2680, 3752, 4154, 4340, 4588, 4690, 4958, 5180, 5735, 8029, 8308, 8680, 9176, 9380, 9916, 10360, 10385, 11470, 12395, 14539, 16058, 16616, 17353, 18760, 19832, 20770, 22940, 24790, 29078, 32116, 34706, 40145, 41540, 45880, 49580, 58156, 64232, 69412, 72695, 76849, 80290, 83080, 86765, 99160, 116312, 138824, 145390, 153698, 160580, 173530, 290780, 307396, 321160, 347060, 384245, 537943, 581560, 614792, 694120, 768490, 1075886, 1536980, 2151772, 2689715, 3073960, 4303544, 5379430, 10758860, 21517720]

約数ペア:

[(1, 21517720), (2, 10758860), (4, 5379430), (5, 4303544), (7, 3073960), (8, 2689715), (10, 2151772), (14, 1536980), (20, 1075886), (28, 768490), (31, 694120), (35, 614792), (37, 581560), (40, 537943), (56, 384245), (62, 347060), (67, 321160), (70, 307396), (74, 290780), (124, 173530), (134, 160580), (140, 153698), (148, 145390), (155, 138824), (185, 116312), (217, 99160), (248, 86765), (259, 83080), (268, 80290), (280, 76849), (296, 72695), (310, 69412), (335, 64232), (370, 58156), (434, 49580), (469, 45880), (518, 41540), (536, 40145), (620, 34706), (670, 32116), (740, 29078), (868, 24790), (938, 22940), (1036, 20770), (1085, 19832), (1147, 18760), (1240, 17353), (1295, 16616), (1340, 16058), (1480, 14539), (1736, 12395), (1876, 11470), (2072, 10385), (2077, 10360), (2170, 9916), (2294, 9380), (2345, 9176), (2479, 8680), (2590, 8308), (2680, 8029), (3752, 5735), (4154, 5180), (4340, 4958), (4588, 4690)]