20746960

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19949}}^1$

素因数の和:19975

約数の個数: 40

約数和(自身を含む): 51949800

約数和(自身を除く): 31202840

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19949, 39898, 79796, 99745, 159592, 199490, 259337, 319184, 398980, 518674, 797960, 1037348, 1296685, 1595920, 2074696, 2593370, 4149392, 5186740, 10373480, 20746960]

約数ペア:

[(1, 20746960), (2, 10373480), (4, 5186740), (5, 4149392), (8, 2593370), (10, 2074696), (13, 1595920), (16, 1296685), (20, 1037348), (26, 797960), (40, 518674), (52, 398980), (65, 319184), (80, 259337), (104, 199490), (130, 159592), (208, 99745), (260, 79796), (520, 39898), (1040, 19949)]