21792020

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{97}}^1\times {\mathrm{239}}^1$

素因数の和:392

約数の個数: 48

約数和(自身を含む): 47416320

約数和(自身を除く): 25624300

約数列:

[1, 2, 4, 5, 10, 20, 47, 94, 97, 188, 194, 235, 239, 388, 470, 478, 485, 940, 956, 970, 1195, 1940, 2390, 4559, 4780, 9118, 11233, 18236, 22466, 22795, 23183, 44932, 45590, 46366, 56165, 91180, 92732, 112330, 115915, 224660, 231830, 463660, 1089601, 2179202, 4358404, 5448005, 10896010, 21792020]

約数ペア:

[(1, 21792020), (2, 10896010), (4, 5448005), (5, 4358404), (10, 2179202), (20, 1089601), (47, 463660), (94, 231830), (97, 224660), (188, 115915), (194, 112330), (235, 92732), (239, 91180), (388, 56165), (470, 46366), (478, 45590), (485, 44932), (940, 23183), (956, 22795), (970, 22466), (1195, 18236), (1940, 11233), (2390, 9118), (4559, 4780)]