20512612103 has 4 divisors (see below), whose sum is σ = 20513246568. Its totient is φ = 20511977640.

The previous prime is 20512612039. The next prime is 20512612117. The reversal of 20512612103 is 30121621502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20512612103 - 2⁶ = 20512612039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512612193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265976 + ... + 334317.

It is an arithmetic number, because the mean of its divisors is an integer number (5128311642).

Almost surely, 2^20512612103 is an apocalyptic number.

20512612103 is a deficient number, since it is larger than the sum of its proper divisors (634465).

20512612103 is an equidigital number, since it uses as much as digits as its factorization.

20512612103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634464.

The product of its (nonzero) digits is 720, while the sum is 23.

The spelling of 20512612103 in words is "twenty billion, five hundred twelve million, six hundred twelve thousand, one hundred three".