81631120

素因数分解:

$2^4\times 5^1\times {\mathrm{1020389}}^1$

素因数の和:1020402

約数の個数: 20

約数和(自身を含む): 189792540

約数和(自身を除く): 108161420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1020389, 2040778, 4081556, 5101945, 8163112, 10203890, 16326224, 20407780, 40815560, 81631120]

約数ペア:

[(1, 81631120), (2, 40815560), (4, 20407780), (5, 16326224), (8, 10203890), (10, 8163112), (16, 5101945), (20, 4081556), (40, 2040778), (80, 1020389)]