81291980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{7541}}^1$

素因数の和:7575

約数の個数: 72

約数和(自身を含む): 216666576

約数和(自身を除く): 135374596

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 49, 55, 70, 77, 98, 110, 140, 154, 196, 220, 245, 308, 385, 490, 539, 770, 980, 1078, 1540, 2156, 2695, 5390, 7541, 10780, 15082, 30164, 37705, 52787, 75410, 82951, 105574, 150820, 165902, 211148, 263935, 331804, 369509, 414755, 527870, 580657, 739018, 829510, 1055740, 1161314, 1478036, 1659020, 1847545, 2322628, 2903285, 3695090, 4064599, 5806570, 7390180, 8129198, 11613140, 16258396, 20322995, 40645990, 81291980]

約数ペア:

[(1, 81291980), (2, 40645990), (4, 20322995), (5, 16258396), (7, 11613140), (10, 8129198), (11, 7390180), (14, 5806570), (20, 4064599), (22, 3695090), (28, 2903285), (35, 2322628), (44, 1847545), (49, 1659020), (55, 1478036), (70, 1161314), (77, 1055740), (98, 829510), (110, 739018), (140, 580657), (154, 527870), (196, 414755), (220, 369509), (245, 331804), (308, 263935), (385, 211148), (490, 165902), (539, 150820), (770, 105574), (980, 82951), (1078, 75410), (1540, 52787), (2156, 37705), (2695, 30164), (5390, 15082), (7541, 10780)]