20019920903 has 4 divisors (see below), whose sum is σ = 20024111328. Its totient is φ = 20015730480.

The previous prime is 20019920867. The next prime is 20019920909. The reversal of 20019920903 is 30902991002.

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 20019920903 - 2¹⁰ = 20019919879 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 (20019920909) 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, 2088038 + ... + 2097603.

It is an arithmetic number, because the mean of its divisors is an integer number (5006027832).

Almost surely, 2^20019920903 is an apocalyptic number.

20019920903 is a deficient number, since it is larger than the sum of its proper divisors (4190425).

20019920903 is an equidigital number, since it uses as much as digits as its factorization.

20019920903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4190424.

The product of its (nonzero) digits is 8748, while the sum is 35.

The spelling of 20019920903 in words is "twenty billion, nineteen million, nine hundred twenty thousand, nine hundred three".