20515720

素因数分解:

$2^3\times 5^1\times {\mathrm{563}}^1\times {\mathrm{911}}^1$

素因数の和:1485

約数の個数: 32

約数和(自身を含む): 46293120

約数和(自身を除く): 25777400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 563, 911, 1126, 1822, 2252, 2815, 3644, 4504, 4555, 5630, 7288, 9110, 11260, 18220, 22520, 36440, 512893, 1025786, 2051572, 2564465, 4103144, 5128930, 10257860, 20515720]

約数ペア:

[(1, 20515720), (2, 10257860), (4, 5128930), (5, 4103144), (8, 2564465), (10, 2051572), (20, 1025786), (40, 512893), (563, 36440), (911, 22520), (1126, 18220), (1822, 11260), (2252, 9110), (2815, 7288), (3644, 5630), (4504, 4555)]