81382690

素因数分解:

$2^1\times 5^1\times {\mathrm{389}}^1\times {\mathrm{20921}}^1$

素因数の和:21317

約数の個数: 16

約数和(自身を含む): 146872440

約数和(自身を除く): 65489750

約数列:

[1, 2, 5, 10, 389, 778, 1945, 3890, 20921, 41842, 104605, 209210, 8138269, 16276538, 40691345, 81382690]

約数ペア:

[(1, 81382690), (2, 40691345), (5, 16276538), (10, 8138269), (389, 209210), (778, 104605), (1945, 41842), (3890, 20921)]