20520025 has 24 divisors (see below), whose sum is σ = 26855424. Its totient is φ = 15523200.

The previous prime is 20519977. The next prime is 20520029. The reversal of 20520025 is 52002502.

It is not a de Polignac number, because 20520025 - 2²³ = 12131417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20519990 and 20520008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72885 + ... + 73165.

It is an arithmetic number, because the mean of its divisors is an integer number (1118976).

Almost surely, 2^20520025 is an apocalyptic number.

20520025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20520025 is a deficient number, since it is larger than the sum of its proper divisors (6335399).

20520025 is a wasteful number, since it uses less digits than its factorization.

20520025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20520025 is about 4529.9034206040. The cubic root of 20520025 is about 273.7742693050.

Adding to 20520025 its reverse (52002502), we get a palindrome (72522527).

The spelling of 20520025 in words is "twenty million, five hundred twenty thousand, twenty-five".