18947920

素因数分解:

$2^4\times 5^1\times {\mathrm{239}}^1\times {\mathrm{991}}^1$

素因数の和:1243

約数の個数: 40

約数和(自身を含む): 44282880

約数和(自身を除く): 25334960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 239, 478, 956, 991, 1195, 1912, 1982, 2390, 3824, 3964, 4780, 4955, 7928, 9560, 9910, 15856, 19120, 19820, 39640, 79280, 236849, 473698, 947396, 1184245, 1894792, 2368490, 3789584, 4736980, 9473960, 18947920]

約数ペア:

[(1, 18947920), (2, 9473960), (4, 4736980), (5, 3789584), (8, 2368490), (10, 1894792), (16, 1184245), (20, 947396), (40, 473698), (80, 236849), (239, 79280), (478, 39640), (956, 19820), (991, 19120), (1195, 15856), (1912, 9910), (1982, 9560), (2390, 7928), (3824, 4955), (3964, 4780)]