18891496

素因数分解:

$2^3\times {\mathrm{13}}^2\times {\mathrm{89}}^1\times {\mathrm{157}}^1$

素因数の和:278

約数の個数: 48

約数和(自身を含む): 39033900

約数和(自身を除く): 20142404

約数列:

[1, 2, 4, 8, 13, 26, 52, 89, 104, 157, 169, 178, 314, 338, 356, 628, 676, 712, 1157, 1256, 1352, 2041, 2314, 4082, 4628, 8164, 9256, 13973, 15041, 16328, 26533, 27946, 30082, 53066, 55892, 60164, 106132, 111784, 120328, 181649, 212264, 363298, 726596, 1453192, 2361437, 4722874, 9445748, 18891496]

約数ペア:

[(1, 18891496), (2, 9445748), (4, 4722874), (8, 2361437), (13, 1453192), (26, 726596), (52, 363298), (89, 212264), (104, 181649), (157, 120328), (169, 111784), (178, 106132), (314, 60164), (338, 55892), (356, 53066), (628, 30082), (676, 27946), (712, 26533), (1157, 16328), (1256, 15041), (1352, 13973), (2041, 9256), (2314, 8164), (4082, 4628)]