20687840

素因数分解:

$2^5\times 5^1\times {\mathrm{239}}^1\times {\mathrm{541}}^1$

素因数の和:795

約数の個数: 48

約数和(自身を含む): 49170240

約数和(自身を除く): 28482400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 239, 478, 541, 956, 1082, 1195, 1912, 2164, 2390, 2705, 3824, 4328, 4780, 5410, 7648, 8656, 9560, 10820, 17312, 19120, 21640, 38240, 43280, 86560, 129299, 258598, 517196, 646495, 1034392, 1292990, 2068784, 2585980, 4137568, 5171960, 10343920, 20687840]

約数ペア:

[(1, 20687840), (2, 10343920), (4, 5171960), (5, 4137568), (8, 2585980), (10, 2068784), (16, 1292990), (20, 1034392), (32, 646495), (40, 517196), (80, 258598), (160, 129299), (239, 86560), (478, 43280), (541, 38240), (956, 21640), (1082, 19120), (1195, 17312), (1912, 10820), (2164, 9560), (2390, 8656), (2705, 7648), (3824, 5410), (4328, 4780)]