20537725 has 18 divisors (see below), whose sum is σ = 27582126. Its totient is φ = 15163200.

The previous prime is 20537719. The next prime is 20537743. The reversal of 20537725 is 52773502.

It can be written as a sum of positive squares in 9 ways, for example, as 8048569 + 12489156 = 2837^2 + 3534^2 .

It is not a de Polignac number, because 20537725 - 2⁹ = 20537213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1795 + ... + 6655.

Almost surely, 2^20537725 is an apocalyptic number.

20537725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20537725 is a deficient number, since it is larger than the sum of its proper divisors (7044401).

20537725 is a wasteful number, since it uses less digits than its factorization.

20537725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4897 (or 4879 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 31.

The square root of 20537725 is about 4531.8566835239. The cubic root of 20537725 is about 273.8529633604.

The spelling of 20537725 in words is "twenty million, five hundred thirty-seven thousand, seven hundred twenty-five".