19997525

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{211}}^1\times {\mathrm{223}}^1$

素因数の和:461

約数の個数: 24

約数和(自身を含む): 26498304

約数和(自身を除く): 6500779

約数列:

[1, 5, 17, 25, 85, 211, 223, 425, 1055, 1115, 3587, 3791, 5275, 5575, 17935, 18955, 47053, 89675, 94775, 235265, 799901, 1176325, 3999505, 19997525]

約数ペア:

[(1, 19997525), (5, 3999505), (17, 1176325), (25, 799901), (85, 235265), (211, 94775), (223, 89675), (425, 47053), (1055, 18955), (1115, 17935), (3587, 5575), (3791, 5275)]