20623643267 has 4 divisors (see below), whose sum is σ = 20625500616. Its totient is φ = 20621785920.

The previous prime is 20623643153. The next prime is 20623643321. The reversal of 20623643267 is 76234632602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20623643267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20623643767) 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, 911918 + ... + 934259.

It is an arithmetic number, because the mean of its divisors is an integer number (5156375154).

Almost surely, 2^20623643267 is an apocalyptic number.

20623643267 is a deficient number, since it is larger than the sum of its proper divisors (1857349).

20623643267 is a wasteful number, since it uses less digits than its factorization.

20623643267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857348.

The product of its (nonzero) digits is 435456, while the sum is 41.

The spelling of 20623643267 in words is "twenty billion, six hundred twenty-three million, six hundred forty-three thousand, two hundred sixty-seven".