20909915

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{127}}^1\times {\mathrm{149}}^1$

素因数の和:311

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 8120485

約数列:

[1, 5, 13, 17, 65, 85, 127, 149, 221, 635, 745, 1105, 1651, 1937, 2159, 2533, 8255, 9685, 10795, 12665, 18923, 28067, 32929, 94615, 140335, 164645, 245999, 321691, 1229995, 1608455, 4181983, 20909915]

約数ペア:

[(1, 20909915), (5, 4181983), (13, 1608455), (17, 1229995), (65, 321691), (85, 245999), (127, 164645), (149, 140335), (221, 94615), (635, 32929), (745, 28067), (1105, 18923), (1651, 12665), (1937, 10795), (2159, 9685), (2533, 8255)]