20279971783 has 16 divisors (see below), whose sum is σ = 20620600000. Its totient is φ = 19942640640.

The previous prime is 20279971753. The next prime is 20279971843. The reversal of 20279971783 is 38717997202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20279971783 - 2²⁵ = 20246417351 is a prime.

It is a super-2 number, since 2×20279971783² (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 (20279971753) 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, 16236343 + ... + 16237591.

It is an arithmetic number, because the mean of its divisors is an integer number (1288787500).

Almost surely, 2^20279971783 is an apocalyptic number.

20279971783 is a deficient number, since it is larger than the sum of its proper divisors (340628217).

20279971783 is a wasteful number, since it uses less digits than its factorization.

20279971783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 20279971783 in words is "twenty billion, two hundred seventy-nine million, nine hundred seventy-one thousand, seven hundred eighty-three".