20915570

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{349}}^1\times {\mathrm{461}}^1$

素因数の和:830

約数の個数: 32

約数和(自身を含む): 40748400

約数和(自身を除く): 19832830

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 349, 461, 698, 922, 1745, 2305, 3490, 4537, 4610, 5993, 9074, 11986, 22685, 29965, 45370, 59930, 160889, 321778, 804445, 1608890, 2091557, 4183114, 10457785, 20915570]

約数ペア:

[(1, 20915570), (2, 10457785), (5, 4183114), (10, 2091557), (13, 1608890), (26, 804445), (65, 321778), (130, 160889), (349, 59930), (461, 45370), (698, 29965), (922, 22685), (1745, 11986), (2305, 9074), (3490, 5993), (4537, 4610)]