81006400

素因数分解:

$2^6\times 5^2\times {\mathrm{197}}^1\times {\mathrm{257}}^1$

素因数の和:476

約数の個数: 84

約数和(自身を含む): 201117708

約数和(自身を除く): 120111308

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 160, 197, 200, 257, 320, 394, 400, 514, 788, 800, 985, 1028, 1285, 1576, 1600, 1970, 2056, 2570, 3152, 3940, 4112, 4925, 5140, 6304, 6425, 7880, 8224, 9850, 10280, 12608, 12850, 15760, 16448, 19700, 20560, 25700, 31520, 39400, 41120, 50629, 51400, 63040, 78800, 82240, 101258, 102800, 157600, 202516, 205600, 253145, 315200, 405032, 411200, 506290, 810064, 1012580, 1265725, 1620128, 2025160, 2531450, 3240256, 4050320, 5062900, 8100640, 10125800, 16201280, 20251600, 40503200, 81006400]

約数ペア:

[(1, 81006400), (2, 40503200), (4, 20251600), (5, 16201280), (8, 10125800), (10, 8100640), (16, 5062900), (20, 4050320), (25, 3240256), (32, 2531450), (40, 2025160), (50, 1620128), (64, 1265725), (80, 1012580), (100, 810064), (160, 506290), (197, 411200), (200, 405032), (257, 315200), (320, 253145), (394, 205600), (400, 202516), (514, 157600), (788, 102800), (800, 101258), (985, 82240), (1028, 78800), (1285, 63040), (1576, 51400), (1600, 50629), (1970, 41120), (2056, 39400), (2570, 31520), (3152, 25700), (3940, 20560), (4112, 19700), (4925, 16448), (5140, 15760), (6304, 12850), (6425, 12608), (7880, 10280), (8224, 9850)]