20506113 has 12 divisors (see below), whose sum is σ = 29712228. Its totient is φ = 13628160.

The previous prime is 20506093. The next prime is 20506151. The reversal of 20506113 is 31160502.

20506113 is a `hidden beast` number, since 2 + 0 + 50 + 611 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11068929 + 9437184 = 3327^2 + 3072^2 .

It is not a de Polignac number, because 20506113 - 2⁵ = 20506081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348 + ... + 6413.

It is an arithmetic number, because the mean of its divisors is an integer number (2476019).

Almost surely, 2^20506113 is an apocalyptic number.

It is an amenable number.

20506113 is a deficient number, since it is larger than the sum of its proper divisors (9206115).

20506113 is a wasteful number, since it uses less digits than its factorization.

20506113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104 (or 7101 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20506113 is about 4528.3675866696. The cubic root of 20506113 is about 273.7123848986.

Adding to 20506113 its reverse (31160502), we get a palindrome (51666615).

The spelling of 20506113 in words is "twenty million, five hundred six thousand, one hundred thirteen".