18971888

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{197}}^1\times {\mathrm{463}}^1$

素因数の和:681

約数の個数: 40

約数和(自身を含む): 39872448

約数和(自身を除く): 20900560

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 197, 208, 394, 463, 788, 926, 1576, 1852, 2561, 3152, 3704, 5122, 6019, 7408, 10244, 12038, 20488, 24076, 40976, 48152, 91211, 96304, 182422, 364844, 729688, 1185743, 1459376, 2371486, 4742972, 9485944, 18971888]

約数ペア:

[(1, 18971888), (2, 9485944), (4, 4742972), (8, 2371486), (13, 1459376), (16, 1185743), (26, 729688), (52, 364844), (104, 182422), (197, 96304), (208, 91211), (394, 48152), (463, 40976), (788, 24076), (926, 20488), (1576, 12038), (1852, 10244), (2561, 7408), (3152, 6019), (3704, 5122)]