81697780

素因数分解:

$2^2\times 5^1\times {\mathrm{389}}^1\times {\mathrm{10501}}^1$

素因数の和:10899

約数の個数: 24

約数和(自身を含む): 172022760

約数和(自身を除く): 90324980

約数列:

[1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 3890, 7780, 10501, 21002, 42004, 52505, 105010, 210020, 4084889, 8169778, 16339556, 20424445, 40848890, 81697780]

約数ペア:

[(1, 81697780), (2, 40848890), (4, 20424445), (5, 16339556), (10, 8169778), (20, 4084889), (389, 210020), (778, 105010), (1556, 52505), (1945, 42004), (3890, 21002), (7780, 10501)]