19990831

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1$

素因数の和:199

約数の個数: 32

約数和(自身を含む): 25574400

約数和(自身を除く): 5583569

約数列:

[1, 7, 19, 29, 71, 73, 133, 203, 497, 511, 551, 1349, 1387, 2059, 2117, 3857, 5183, 9443, 9709, 14413, 14819, 36281, 39121, 40223, 98477, 150307, 273847, 281561, 689339, 1052149, 2855833, 19990831]

約数ペア:

[(1, 19990831), (7, 2855833), (19, 1052149), (29, 689339), (71, 281561), (73, 273847), (133, 150307), (203, 98477), (497, 40223), (511, 39121), (551, 36281), (1349, 14819), (1387, 14413), (2059, 9709), (2117, 9443), (3857, 5183)]