20512113 has 32 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 12492480.

The previous prime is 20512087. The next prime is 20512139. The reversal of 20512113 is 31121502.

It is an interprime number because it is at equal distance from previous prime (20512087) and next prime (20512139).

It is not a de Polignac number, because 20512113 - 2¹⁸ = 20249969 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20512092 and 20512101.

It is not an unprimeable number, because it can be changed into a prime (20512213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259608 + ... + 259686.

It is an arithmetic number, because the mean of its divisors is an integer number (933120).

Almost surely, 2^20512113 is an apocalyptic number.

20512113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20512113 is a deficient number, since it is larger than the sum of its proper divisors (9347727).

20512113 is a wasteful number, since it uses less digits than its factorization.

20512113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20512113 is about 4529.0300286044. The cubic root of 20512113 is about 273.7390779821.

Adding to 20512113 its reverse (31121502), we get a palindrome (51633615).

The spelling of 20512113 in words is "twenty million, five hundred twelve thousand, one hundred thirteen".