81272980

素因数分解:

$2^2\times 5^1\times {\mathrm{211}}^1\times {\mathrm{19259}}^1$

素因数の和:19479

約数の個数: 24

約数和(自身を含む): 171491040

約数和(自身を除く): 90218060

約数列:

[1, 2, 4, 5, 10, 20, 211, 422, 844, 1055, 2110, 4220, 19259, 38518, 77036, 96295, 192590, 385180, 4063649, 8127298, 16254596, 20318245, 40636490, 81272980]

約数ペア:

[(1, 81272980), (2, 40636490), (4, 20318245), (5, 16254596), (10, 8127298), (20, 4063649), (211, 385180), (422, 192590), (844, 96295), (1055, 77036), (2110, 38518), (4220, 19259)]