21315807

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{127}}^1\times {\mathrm{1097}}^1$

素因数の和:1247

約数の個数: 24

約数和(自身を含む): 32887296

約数和(自身を除く): 11571489

約数列:

[1, 3, 9, 17, 51, 127, 153, 381, 1097, 1143, 2159, 3291, 6477, 9873, 18649, 19431, 55947, 139319, 167841, 417957, 1253871, 2368423, 7105269, 21315807]

約数ペア:

[(1, 21315807), (3, 7105269), (9, 2368423), (17, 1253871), (51, 417957), (127, 167841), (153, 139319), (381, 55947), (1097, 19431), (1143, 18649), (2159, 9873), (3291, 6477)]