20857369799 has 16 divisors (see below), whose sum is σ = 23996682240. Its totient is φ = 17758254240.

The previous prime is 20857369783. The next prime is 20857369829. The reversal of 20857369799 is 99796375802.

It is a cyclic number.

It is not a de Polignac number, because 20857369799 - 2⁴ = 20857369783 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 (20857369759) 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, 936932 + ... + 958934.

It is an arithmetic number, because the mean of its divisors is an integer number (1499792640).

Almost surely, 2^20857369799 is an apocalyptic number.

20857369799 is a deficient number, since it is larger than the sum of its proper divisors (3139312441).

20857369799 is a wasteful number, since it uses less digits than its factorization.

20857369799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22910.

The product of its (nonzero) digits is 51438240, while the sum is 65.

The spelling of 20857369799 in words is "twenty billion, eight hundred fifty-seven million, three hundred sixty-nine thousand, seven hundred ninety-nine".