21156849

素因数分解:

$3^3\times 7^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{157}}^1$

素因数の和:227

約数の個数: 64

約数和(自身を含む): 38830080

約数和(自身を除く): 17673231

約数列:

[1, 3, 7, 9, 21, 23, 27, 31, 63, 69, 93, 157, 161, 189, 207, 217, 279, 471, 483, 621, 651, 713, 837, 1099, 1413, 1449, 1953, 2139, 3297, 3611, 4239, 4347, 4867, 4991, 5859, 6417, 9891, 10833, 14601, 14973, 19251, 25277, 29673, 32499, 34069, 43803, 44919, 75831, 97497, 102207, 111941, 131409, 134757, 227493, 306621, 335823, 682479, 783587, 919863, 1007469, 2350761, 3022407, 7052283, 21156849]

約数ペア:

[(1, 21156849), (3, 7052283), (7, 3022407), (9, 2350761), (21, 1007469), (23, 919863), (27, 783587), (31, 682479), (63, 335823), (69, 306621), (93, 227493), (157, 134757), (161, 131409), (189, 111941), (207, 102207), (217, 97497), (279, 75831), (471, 44919), (483, 43803), (621, 34069), (651, 32499), (713, 29673), (837, 25277), (1099, 19251), (1413, 14973), (1449, 14601), (1953, 10833), (2139, 9891), (3297, 6417), (3611, 5859), (4239, 4991), (4347, 4867)]