20994234845 has 16 divisors (see below), whose sum is σ = 25416892800. Its totient is φ = 16646668224.

The previous prime is 20994234841. The next prime is 20994234853. The reversal of 20994234845 is 54843249902.

It is a cyclic number.

It is not a de Polignac number, because 20994234845 - 2² = 20994234841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20994234793 and 20994234802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994234841) 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, 317744 + ... + 378086.

It is an arithmetic number, because the mean of its divisors is an integer number (1588555800).

Almost surely, 2^20994234845 is an apocalyptic number.

It is an amenable number.

20994234845 is a deficient number, since it is larger than the sum of its proper divisors (4422657955).

20994234845 is a wasteful number, since it uses less digits than its factorization.

20994234845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60964.

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 20994234845 in words is "twenty billion, nine hundred ninety-four million, two hundred thirty-four thousand, eight hundred forty-five".