20903917219 has 4 divisors (see below), whose sum is σ = 21029090544. Its totient is φ = 20778743896.

The previous prime is 20903917217. The next prime is 20903917261. The reversal of 20903917219 is 91271930902.

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 20903917219 - 2¹ = 20903917217 is a prime.

It is a super-2 number, since 2×20903917219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20903917217) 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, 62586412 + ... + 62586745.

It is an arithmetic number, because the mean of its divisors is an integer number (5257272636).

Almost surely, 2^20903917219 is an apocalyptic number.

20903917219 is a deficient number, since it is larger than the sum of its proper divisors (125173325).

20903917219 is a wasteful number, since it uses less digits than its factorization.

20903917219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125173324.

The product of its (nonzero) digits is 61236, while the sum is 43.

The spelling of 20903917219 in words is "twenty billion, nine hundred three million, nine hundred seventeen thousand, two hundred nineteen".