21162880

素因数分解:

$2^7\times 5^1\times {\mathrm{43}}^1\times {\mathrm{769}}^1$

素因数の和:831

約数の個数: 64

約数和(自身を含む): 51836400

約数和(自身を除く): 30673520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 43, 64, 80, 86, 128, 160, 172, 215, 320, 344, 430, 640, 688, 769, 860, 1376, 1538, 1720, 2752, 3076, 3440, 3845, 5504, 6152, 6880, 7690, 12304, 13760, 15380, 24608, 27520, 30760, 33067, 49216, 61520, 66134, 98432, 123040, 132268, 165335, 246080, 264536, 330670, 492160, 529072, 661340, 1058144, 1322680, 2116288, 2645360, 4232576, 5290720, 10581440, 21162880]

約数ペア:

[(1, 21162880), (2, 10581440), (4, 5290720), (5, 4232576), (8, 2645360), (10, 2116288), (16, 1322680), (20, 1058144), (32, 661340), (40, 529072), (43, 492160), (64, 330670), (80, 264536), (86, 246080), (128, 165335), (160, 132268), (172, 123040), (215, 98432), (320, 66134), (344, 61520), (430, 49216), (640, 33067), (688, 30760), (769, 27520), (860, 24608), (1376, 15380), (1538, 13760), (1720, 12304), (2752, 7690), (3076, 6880), (3440, 6152), (3845, 5504)]