20806695393 has 16 divisors (see below), whose sum is σ = 30485198016. Its totient is φ = 12518071040.

The previous prime is 20806695359. The next prime is 20806695419. The reversal of 20806695393 is 39359660802.

It is a cyclic number.

It is not a de Polignac number, because 20806695393 - 2¹⁷ = 20806564321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20806695323) 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, 2296596 + ... + 2305637.

It is an arithmetic number, because the mean of its divisors is an integer number (1905324876).

Almost surely, 2^20806695393 is an apocalyptic number.

It is an amenable number.

20806695393 is a deficient number, since it is larger than the sum of its proper divisors (9678502623).

20806695393 is a wasteful number, since it uses less digits than its factorization.

20806695393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4602384.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The spelling of 20806695393 in words is "twenty billion, eight hundred six million, six hundred ninety-five thousand, three hundred ninety-three".