20840800

素因数分解:

$2^5\times 5^2\times {\mathrm{109}}^1\times {\mathrm{239}}^1$

素因数の和:368

約数の個数: 72

約数和(自身を含む): 51559200

約数和(自身を除く): 30718400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 109, 160, 200, 218, 239, 400, 436, 478, 545, 800, 872, 956, 1090, 1195, 1744, 1912, 2180, 2390, 2725, 3488, 3824, 4360, 4780, 5450, 5975, 7648, 8720, 9560, 10900, 11950, 17440, 19120, 21800, 23900, 26051, 38240, 43600, 47800, 52102, 87200, 95600, 104204, 130255, 191200, 208408, 260510, 416816, 521020, 651275, 833632, 1042040, 1302550, 2084080, 2605100, 4168160, 5210200, 10420400, 20840800]

約数ペア:

[(1, 20840800), (2, 10420400), (4, 5210200), (5, 4168160), (8, 2605100), (10, 2084080), (16, 1302550), (20, 1042040), (25, 833632), (32, 651275), (40, 521020), (50, 416816), (80, 260510), (100, 208408), (109, 191200), (160, 130255), (200, 104204), (218, 95600), (239, 87200), (400, 52102), (436, 47800), (478, 43600), (545, 38240), (800, 26051), (872, 23900), (956, 21800), (1090, 19120), (1195, 17440), (1744, 11950), (1912, 10900), (2180, 9560), (2390, 8720), (2725, 7648), (3488, 5975), (3824, 5450), (4360, 4780)]