20892942785 has 32 divisors (see below), whose sum is σ = 29609072640. Its totient is φ = 13952505600.

The previous prime is 20892942781. The next prime is 20892942793. The reversal of 20892942785 is 58724929802.

It is a happy number.

It is not a de Polignac number, because 20892942785 - 2² = 20892942781 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20892942785.

It is not an unprimeable number, because it can be changed into a prime (20892942781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60071 + ... + 213059.

It is an arithmetic number, because the mean of its divisors is an integer number (925283520).

Almost surely, 2^20892942785 is an apocalyptic number.

It is an amenable number.

20892942785 is a deficient number, since it is larger than the sum of its proper divisors (8716129855).

20892942785 is a wasteful number, since it uses less digits than its factorization.

20892942785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153209.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 20892942785 in words is "twenty billion, eight hundred ninety-two million, nine hundred forty-two thousand, seven hundred eighty-five".