19664728

素因数分解:

$2^3\times {\mathrm{71}}^1\times {\mathrm{89}}^1\times {\mathrm{389}}^1$

素因数の和:555

約数の個数: 32

約数和(自身を含む): 37908000

約数和(自身を除く): 18243272

約数列:

[1, 2, 4, 8, 71, 89, 142, 178, 284, 356, 389, 568, 712, 778, 1556, 3112, 6319, 12638, 25276, 27619, 34621, 50552, 55238, 69242, 110476, 138484, 220952, 276968, 2458091, 4916182, 9832364, 19664728]

約数ペア:

[(1, 19664728), (2, 9832364), (4, 4916182), (8, 2458091), (71, 276968), (89, 220952), (142, 138484), (178, 110476), (284, 69242), (356, 55238), (389, 50552), (568, 34621), (712, 27619), (778, 25276), (1556, 12638), (3112, 6319)]