20645306894 has 16 divisors (see below), whose sum is σ = 31521311376. Its totient is φ = 10138694400.

The previous prime is 20645306893. The next prime is 20645306909. The reversal of 20645306894 is 49860354602.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645306893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38147 + ... + 206750.

It is an arithmetic number, because the mean of its divisors is an integer number (1970081961).

Almost surely, 2^20645306894 is an apocalyptic number.

20645306894 is a deficient number, since it is larger than the sum of its proper divisors (10876004482).

20645306894 is a wasteful number, since it uses less digits than its factorization.

20645306894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245651.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 20645306894 in words is "twenty billion, six hundred forty-five million, three hundred six thousand, eight hundred ninety-four".