20506899

素因数分解:

$3^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{79}}^1\times {\mathrm{263}}^1$

素因数の和:399

約数の個数: 32

約数和(自身を含む): 32440320

約数和(自身を除く): 11933421

約数列:

[1, 3, 7, 21, 47, 79, 141, 237, 263, 329, 553, 789, 987, 1659, 1841, 3713, 5523, 11139, 12361, 20777, 25991, 37083, 62331, 77973, 86527, 145439, 259581, 436317, 976519, 2929557, 6835633, 20506899]

約数ペア:

[(1, 20506899), (3, 6835633), (7, 2929557), (21, 976519), (47, 436317), (79, 259581), (141, 145439), (237, 86527), (263, 77973), (329, 62331), (553, 37083), (789, 25991), (987, 20777), (1659, 12361), (1841, 11139), (3713, 5523)]