21345880

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31391}}^1$

素因数の和:31419

約数の個数: 32

約数和(自身を含む): 50855040

約数和(自身を除く): 29509160

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 31391, 62782, 125564, 156955, 251128, 313910, 533647, 627820, 1067294, 1255640, 2134588, 2668235, 4269176, 5336470, 10672940, 21345880]

約数ペア:

[(1, 21345880), (2, 10672940), (4, 5336470), (5, 4269176), (8, 2668235), (10, 2134588), (17, 1255640), (20, 1067294), (34, 627820), (40, 533647), (68, 313910), (85, 251128), (136, 156955), (170, 125564), (340, 62782), (680, 31391)]