20711825 has 12 divisors (see below), whose sum is σ = 26010240. Its totient is φ = 16358160.

The previous prime is 20711807. The next prime is 20711833. The reversal of 20711825 is 52811702.

It is a de Polignac number, because none of the positive numbers 2^k-20711825 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20711794 and 20711803.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3269 + ... + 7218.

It is an arithmetic number, because the mean of its divisors is an integer number (2167520).

Almost surely, 2^20711825 is an apocalyptic number.

20711825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20711825 is a deficient number, since it is larger than the sum of its proper divisors (5298415).

20711825 is a wasteful number, since it uses less digits than its factorization.

20711825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10576 (or 10571 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 20711825 is about 4551.0246099093. The cubic root of 20711825 is about 274.6246117771.

The spelling of 20711825 in words is "twenty million, seven hundred eleven thousand, eight hundred twenty-five".