20864863 has 2 divisors, whose sum is σ = 20864864. Its totient is φ = 20864862.

The previous prime is 20864849. The next prime is 20864923. The reversal of 20864863 is 36846802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20864863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20864803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10432431 + 10432432.

It is an arithmetic number, because the mean of its divisors is an integer number (10432432).

Almost surely, 2^20864863 is an apocalyptic number.

20864863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20864863 is an equidigital number, since it uses as much as digits as its factorization.

20864863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 20864863 is about 4567.8072419926. The cubic root of 20864863 is about 275.2993456605.

The spelling of 20864863 in words is "twenty million, eight hundred sixty-four thousand, eight hundred sixty-three".