81651440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78511}}^1$

素因数の和:78537

約数の個数: 40

約数和(自身を含む): 204445248

約数和(自身を除く): 122793808

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78511, 157022, 314044, 392555, 628088, 785110, 1020643, 1256176, 1570220, 2041286, 3140440, 4082572, 5103215, 6280880, 8165144, 10206430, 16330288, 20412860, 40825720, 81651440]

約数ペア:

[(1, 81651440), (2, 40825720), (4, 20412860), (5, 16330288), (8, 10206430), (10, 8165144), (13, 6280880), (16, 5103215), (20, 4082572), (26, 3140440), (40, 2041286), (52, 1570220), (65, 1256176), (80, 1020643), (104, 785110), (130, 628088), (208, 392555), (260, 314044), (520, 157022), (1040, 78511)]