81856640

素因数分解:

$2^7\times 5^1\times {\mathrm{79}}^1\times {\mathrm{1619}}^1$

素因数の和:1717

約数の個数: 64

約数和(自身を含む): 198288000

約数和(自身を除く): 116431360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 79, 80, 128, 158, 160, 316, 320, 395, 632, 640, 790, 1264, 1580, 1619, 2528, 3160, 3238, 5056, 6320, 6476, 8095, 10112, 12640, 12952, 16190, 25280, 25904, 32380, 50560, 51808, 64760, 103616, 127901, 129520, 207232, 255802, 259040, 511604, 518080, 639505, 1023208, 1036160, 1279010, 2046416, 2558020, 4092832, 5116040, 8185664, 10232080, 16371328, 20464160, 40928320, 81856640]

約数ペア:

[(1, 81856640), (2, 40928320), (4, 20464160), (5, 16371328), (8, 10232080), (10, 8185664), (16, 5116040), (20, 4092832), (32, 2558020), (40, 2046416), (64, 1279010), (79, 1036160), (80, 1023208), (128, 639505), (158, 518080), (160, 511604), (316, 259040), (320, 255802), (395, 207232), (632, 129520), (640, 127901), (790, 103616), (1264, 64760), (1580, 51808), (1619, 50560), (2528, 32380), (3160, 25904), (3238, 25280), (5056, 16190), (6320, 12952), (6476, 12640), (8095, 10112)]