20905880

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2477}}^1$

素因数の和:2699

約数の個数: 32

約数和(自身を含む): 47280240

約数和(自身を除く): 26374360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2477, 4220, 4954, 8440, 9908, 12385, 19816, 24770, 49540, 99080, 522647, 1045294, 2090588, 2613235, 4181176, 5226470, 10452940, 20905880]

約数ペア:

[(1, 20905880), (2, 10452940), (4, 5226470), (5, 4181176), (8, 2613235), (10, 2090588), (20, 1045294), (40, 522647), (211, 99080), (422, 49540), (844, 24770), (1055, 19816), (1688, 12385), (2110, 9908), (2477, 8440), (4220, 4954)]