20012005

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{157}}^1$

素因数の和:265

約数の個数: 32

約数和(自身を含む): 27234144

約数和(自身を除く): 7222139

約数列:

[1, 5, 13, 37, 53, 65, 157, 185, 265, 481, 689, 785, 1961, 2041, 2405, 3445, 5809, 8321, 9805, 10205, 25493, 29045, 41605, 75517, 108173, 127465, 307877, 377585, 540865, 1539385, 4002401, 20012005]

約数ペア:

[(1, 20012005), (5, 4002401), (13, 1539385), (37, 540865), (53, 377585), (65, 307877), (157, 127465), (185, 108173), (265, 75517), (481, 41605), (689, 29045), (785, 25493), (1961, 10205), (2041, 9805), (2405, 8321), (3445, 5809)]