20524825 has 12 divisors (see below), whose sum is σ = 26139820. Its totient is φ = 15975360.

The previous prime is 20524813. The next prime is 20524849. The reversal of 20524825 is 52842502.

20524825 = T₇₀₂ + T₇₀₃ + ... + T₇₇₆.

20524825 = 3203² + 3204².

It can be written as a sum of positive squares in 6 ways, for example, as 597529 + 19927296 = 773^2 + 4464^2 .

It is not a de Polignac number, because 20524825 - 2⁵ = 20524793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20524793 and 20524802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10170 + ... + 12019.

Almost surely, 2^20524825 is an apocalyptic number.

20524825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20524825 is the 3204-th centered square number.

It is an amenable number.

20524825 is a deficient number, since it is larger than the sum of its proper divisors (5614995).

20524825 is a wasteful number, since it uses less digits than its factorization.

20524825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22236 (or 22231 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 20524825 is about 4530.4332022446. The cubic root of 20524825 is about 273.7956145363.

The spelling of 20524825 in words is "twenty million, five hundred twenty-four thousand, eight hundred twenty-five".