20900072

素因数分解:

$2^3\times {\mathrm{17}}^1\times {\mathrm{239}}^1\times {\mathrm{643}}^1$

素因数の和:905

約数の個数: 32

約数和(自身を含む): 41731200

約数和(自身を除く): 20831128

約数列:

[1, 2, 4, 8, 17, 34, 68, 136, 239, 478, 643, 956, 1286, 1912, 2572, 4063, 5144, 8126, 10931, 16252, 21862, 32504, 43724, 87448, 153677, 307354, 614708, 1229416, 2612509, 5225018, 10450036, 20900072]

約数ペア:

[(1, 20900072), (2, 10450036), (4, 5225018), (8, 2612509), (17, 1229416), (34, 614708), (68, 307354), (136, 153677), (239, 87448), (478, 43724), (643, 32504), (956, 21862), (1286, 16252), (1912, 10931), (2572, 8126), (4063, 5144)]