20503145

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{149}}^1$

素因数の和:269

約数の個数: 32

約数和(自身を含む): 27972000

約数和(自身を除く): 7468855

約数列:

[1, 5, 13, 29, 65, 73, 145, 149, 365, 377, 745, 949, 1885, 1937, 2117, 4321, 4745, 9685, 10585, 10877, 21605, 27521, 54385, 56173, 137605, 141401, 280865, 315433, 707005, 1577165, 4100629, 20503145]

約数ペア:

[(1, 20503145), (5, 4100629), (13, 1577165), (29, 707005), (65, 315433), (73, 280865), (145, 141401), (149, 137605), (365, 56173), (377, 54385), (745, 27521), (949, 21605), (1885, 10877), (1937, 10585), (2117, 9685), (4321, 4745)]