20623546456 has 8 divisors (see below), whose sum is σ = 38669149620. Its totient is φ = 10311773224.

The previous prime is 20623546451. The next prime is 20623546477. The reversal of 20623546456 is 65464532602.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20623546451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1288971646 + ... + 1288971661.

Almost surely, 2^20623546456 is an apocalyptic number.

It is an amenable number.

20623546456 is a deficient number, since it is larger than the sum of its proper divisors (18045603164).

20623546456 is a wasteful number, since it uses less digits than its factorization.

20623546456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577943313 (or 2577943309 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 20623546456 in words is "twenty billion, six hundred twenty-three million, five hundred forty-six thousand, four hundred fifty-six".