20894432864 has 24 divisors (see below), whose sum is σ = 41145877080. Its totient is φ = 10444686336.

The previous prime is 20894432863. The next prime is 20894432887. The reversal of 20894432864 is 46823449802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20894432863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58832 + ... + 212720.

It is an arithmetic number, because the mean of its divisors is an integer number (1714411545).

Almost surely, 2^20894432864 is an apocalyptic number.

It is an amenable number.

20894432864 is a deficient number, since it is larger than the sum of its proper divisors (20251444216).

20894432864 is a wasteful number, since it uses less digits than its factorization.

20894432864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158142 (or 158134 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 50.

The spelling of 20894432864 in words is "twenty billion, eight hundred ninety-four million, four hundred thirty-two thousand, eight hundred sixty-four".