21787455

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{1987}}^1$

素因数の和:2055

約数の個数: 32

約数和(自身を含む): 37787904

約数和(自身を除く): 16000449

約数列:

[1, 3, 5, 15, 17, 43, 51, 85, 129, 215, 255, 645, 731, 1987, 2193, 3655, 5961, 9935, 10965, 29805, 33779, 85441, 101337, 168895, 256323, 427205, 506685, 1281615, 1452497, 4357491, 7262485, 21787455]

約数ペア:

[(1, 21787455), (3, 7262485), (5, 4357491), (15, 1452497), (17, 1281615), (43, 506685), (51, 427205), (85, 256323), (129, 168895), (215, 101337), (255, 85441), (645, 33779), (731, 29805), (1987, 10965), (2193, 9935), (3655, 5961)]