20618935919 has 4 divisors (see below), whose sum is σ = 20619332496. Its totient is φ = 20618539344.

The previous prime is 20618935903. The next prime is 20618935927. The reversal of 20618935919 is 91953981602.

It is a happy number.

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 20618935919 - 2⁴ = 20618935903 is a prime.

It is a super-2 number, since 2×20618935919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618935619) 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, 105974 + ... + 229059.

It is an arithmetic number, because the mean of its divisors is an integer number (5154833124).

Almost surely, 2^20618935919 is an apocalyptic number.

20618935919 is a deficient number, since it is larger than the sum of its proper divisors (396577).

20618935919 is an equidigital number, since it uses as much as digits as its factorization.

20618935919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396576.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The spelling of 20618935919 in words is "twenty billion, six hundred eighteen million, nine hundred thirty-five thousand, nine hundred nineteen".