20609545919 has 4 divisors (see below), whose sum is σ = 21048046944. Its totient is φ = 20171044896.

The previous prime is 20609545907. The next prime is 20609545969. The reversal of 20609545919 is 91954590602.

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

It is a de Polignac number, because none of the positive numbers 2^k-20609545919 is a prime.

It is a super-2 number, since 2×20609545919² (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 (20609545969) 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, 219250442 + ... + 219250535.

It is an arithmetic number, because the mean of its divisors is an integer number (5262011736).

Almost surely, 2^20609545919 is an apocalyptic number.

20609545919 is a deficient number, since it is larger than the sum of its proper divisors (438501025).

20609545919 is an equidigital number, since it uses as much as digits as its factorization.

20609545919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438501024.

The product of its (nonzero) digits is 874800, while the sum is 50.

The spelling of 20609545919 in words is "twenty billion, six hundred nine million, five hundred forty-five thousand, nine hundred nineteen".