20025513 has 6 divisors (see below), whose sum is σ = 28925754. Its totient is φ = 13350336.

The previous prime is 20025503. The next prime is 20025517. The reversal of 20025513 is 31552002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 205209 = 4452^2 + 453^2 .

It is not a de Polignac number, because 20025513 - 2⁴ = 20025497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20025517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112520 + ... + 1112537.

It is an arithmetic number, because the mean of its divisors is an integer number (4820959).

Almost surely, 2^20025513 is an apocalyptic number.

It is an amenable number.

20025513 is a deficient number, since it is larger than the sum of its proper divisors (8900241).

20025513 is a wasteful number, since it uses less digits than its factorization.

20025513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225063 (or 2225060 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20025513 is about 4474.9874860160. The cubic root of 20025513 is about 271.5571341762.

Adding to 20025513 its reverse (31552002), we get a palindrome (51577515).

The spelling of 20025513 in words is "twenty million, twenty-five thousand, five hundred thirteen".