20497995

素因数分解:

$3^3\times 5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{199}}^1$

素因数の和:329

約数の個数: 64

約数和(自身を含む): 42240000

約数和(自身を除く): 21742005

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 105, 109, 135, 189, 199, 315, 327, 545, 597, 763, 945, 981, 995, 1393, 1635, 1791, 2289, 2943, 2985, 3815, 4179, 4905, 5373, 6867, 6965, 8955, 11445, 12537, 14715, 20601, 20895, 21691, 26865, 34335, 37611, 62685, 65073, 103005, 108455, 151837, 188055, 195219, 325365, 455511, 585657, 759185, 976095, 1366533, 2277555, 2928285, 4099599, 6832665, 20497995]

約数ペア:

[(1, 20497995), (3, 6832665), (5, 4099599), (7, 2928285), (9, 2277555), (15, 1366533), (21, 976095), (27, 759185), (35, 585657), (45, 455511), (63, 325365), (105, 195219), (109, 188055), (135, 151837), (189, 108455), (199, 103005), (315, 65073), (327, 62685), (545, 37611), (597, 34335), (763, 26865), (945, 21691), (981, 20895), (995, 20601), (1393, 14715), (1635, 12537), (1791, 11445), (2289, 8955), (2943, 6965), (2985, 6867), (3815, 5373), (4179, 4905)]