21748720

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{547}}^1$

素因数の和:638

約数の個数: 80

約数和(自身を含む): 58710528

約数和(自身を除く): 36961808

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 71, 80, 112, 140, 142, 280, 284, 355, 497, 547, 560, 568, 710, 994, 1094, 1136, 1420, 1988, 2188, 2485, 2735, 2840, 3829, 3976, 4376, 4970, 5470, 5680, 7658, 7952, 8752, 9940, 10940, 15316, 19145, 19880, 21880, 30632, 38290, 38837, 39760, 43760, 61264, 76580, 77674, 153160, 155348, 194185, 271859, 306320, 310696, 388370, 543718, 621392, 776740, 1087436, 1359295, 1553480, 2174872, 2718590, 3106960, 4349744, 5437180, 10874360, 21748720]

約数ペア:

[(1, 21748720), (2, 10874360), (4, 5437180), (5, 4349744), (7, 3106960), (8, 2718590), (10, 2174872), (14, 1553480), (16, 1359295), (20, 1087436), (28, 776740), (35, 621392), (40, 543718), (56, 388370), (70, 310696), (71, 306320), (80, 271859), (112, 194185), (140, 155348), (142, 153160), (280, 77674), (284, 76580), (355, 61264), (497, 43760), (547, 39760), (560, 38837), (568, 38290), (710, 30632), (994, 21880), (1094, 19880), (1136, 19145), (1420, 15316), (1988, 10940), (2188, 9940), (2485, 8752), (2735, 7952), (2840, 7658), (3829, 5680), (3976, 5470), (4376, 4970)]