20979265803 has 16 divisors (see below), whose sum is σ = 29911039776. Its totient is φ = 13033126400.

The previous prime is 20979265781. The next prime is 20979265823. The reversal of 20979265803 is 30856297902.

It is a cyclic number.

It is not a de Polignac number, because 20979265803 - 2⁹ = 20979265291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (20979265823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2031276 + ... + 2041577.

It is an arithmetic number, because the mean of its divisors is an integer number (1869439986).

Almost surely, 2^20979265803 is an apocalyptic number.

20979265803 is a deficient number, since it is larger than the sum of its proper divisors (8931773973).

20979265803 is a wasteful number, since it uses less digits than its factorization.

20979265803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072974.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 20979265803 in words is "twenty billion, nine hundred seventy-nine million, two hundred sixty-five thousand, eight hundred three".