20019890

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{193}}^1$

素因数の和:275

約数の個数: 64

約数和(自身を含む): 42239232

約数和(自身を除く): 22219342

約数列:

[1, 2, 5, 10, 11, 22, 23, 41, 46, 55, 82, 110, 115, 193, 205, 230, 253, 386, 410, 451, 506, 902, 943, 965, 1265, 1886, 1930, 2123, 2255, 2530, 4246, 4439, 4510, 4715, 7913, 8878, 9430, 10373, 10615, 15826, 20746, 21230, 22195, 39565, 44390, 48829, 51865, 79130, 87043, 97658, 103730, 174086, 181999, 244145, 363998, 435215, 488290, 870430, 909995, 1819990, 2001989, 4003978, 10009945, 20019890]

約数ペア:

[(1, 20019890), (2, 10009945), (5, 4003978), (10, 2001989), (11, 1819990), (22, 909995), (23, 870430), (41, 488290), (46, 435215), (55, 363998), (82, 244145), (110, 181999), (115, 174086), (193, 103730), (205, 97658), (230, 87043), (253, 79130), (386, 51865), (410, 48829), (451, 44390), (506, 39565), (902, 22195), (943, 21230), (965, 20746), (1265, 15826), (1886, 10615), (1930, 10373), (2123, 9430), (2255, 8878), (2530, 7913), (4246, 4715), (4439, 4510)]