21003455

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{199}}^1$

素因数の和:335

約数の個数: 32

約数和(自身を含む): 29376000

約数和(自身を除く): 8372545

約数列:

[1, 5, 11, 19, 55, 95, 101, 199, 209, 505, 995, 1045, 1111, 1919, 2189, 3781, 5555, 9595, 10945, 18905, 20099, 21109, 41591, 100495, 105545, 207955, 221089, 381881, 1105445, 1909405, 4200691, 21003455]

約数ペア:

[(1, 21003455), (5, 4200691), (11, 1909405), (19, 1105445), (55, 381881), (95, 221089), (101, 207955), (199, 105545), (209, 100495), (505, 41591), (995, 21109), (1045, 20099), (1111, 18905), (1919, 10945), (2189, 9595), (3781, 5555)]