20525837 has 4 divisors (see below), whose sum is σ = 20565756. Its totient is φ = 20485920.

The previous prime is 20525831. The next prime is 20525839. The reversal of 20525837 is 73852502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10407076 + 10118761 = 3226^2 + 3181^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525837 - 2⁶ = 20525773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19178 + ... + 20219.

It is an arithmetic number, because the mean of its divisors is an integer number (5141439).

Almost surely, 2^20525837 is an apocalyptic number.

It is an amenable number.

20525837 is a deficient number, since it is larger than the sum of its proper divisors (39919).

20525837 is an equidigital number, since it uses as much as digits as its factorization.

20525837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39918.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 20525837 is about 4530.5448899663. The cubic root of 20525837 is about 273.8001143978.

The spelling of 20525837 in words is "twenty million, five hundred twenty-five thousand, eight hundred thirty-seven".