20991985

素因数分解:

$5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{89}}^1\times {\mathrm{293}}^1$

素因数の和:417

約数の個数: 32

約数和(自身を含む): 30481920

約数和(自身を除く): 9489935

約数列:

[1, 5, 7, 23, 35, 89, 115, 161, 293, 445, 623, 805, 1465, 2047, 2051, 3115, 6739, 10235, 10255, 14329, 26077, 33695, 47173, 71645, 130385, 182539, 235865, 599771, 912695, 2998855, 4198397, 20991985]

約数ペア:

[(1, 20991985), (5, 4198397), (7, 2998855), (23, 912695), (35, 599771), (89, 235865), (115, 182539), (161, 130385), (293, 71645), (445, 47173), (623, 33695), (805, 26077), (1465, 14329), (2047, 10255), (2051, 10235), (3115, 6739)]