20951371783 has 8 divisors (see below), whose sum is σ = 21003840000. Its totient is φ = 20898946488.

The previous prime is 20951371711. The next prime is 20951371867. The reversal of 20951371783 is 38717315902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20951371783 - 2³³ = 12361437191 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 (20951371703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109898 + ... + 1128616.

It is an arithmetic number, because the mean of its divisors is an integer number (2625480000).

Almost surely, 2^20951371783 is an apocalyptic number.

20951371783 is a deficient number, since it is larger than the sum of its proper divisors (52468217).

20951371783 is a wasteful number, since it uses less digits than its factorization.

20951371783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21461.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 20951371783 in words is "twenty billion, nine hundred fifty-one million, three hundred seventy-one thousand, seven hundred eighty-three".