19121680

素因数分解:

$2^4\times 5^1\times {\mathrm{479}}^1\times {\mathrm{499}}^1$

素因数の和:991

約数の個数: 40

約数和(自身を含む): 44640000

約数和(自身を除く): 25518320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 479, 499, 958, 998, 1916, 1996, 2395, 2495, 3832, 3992, 4790, 4990, 7664, 7984, 9580, 9980, 19160, 19960, 38320, 39920, 239021, 478042, 956084, 1195105, 1912168, 2390210, 3824336, 4780420, 9560840, 19121680]

約数ペア:

[(1, 19121680), (2, 9560840), (4, 4780420), (5, 3824336), (8, 2390210), (10, 1912168), (16, 1195105), (20, 956084), (40, 478042), (80, 239021), (479, 39920), (499, 38320), (958, 19960), (998, 19160), (1916, 9980), (1996, 9580), (2395, 7984), (2495, 7664), (3832, 4990), (3992, 4790)]