20648718623 has 12 divisors (see below), whose sum is σ = 22368956688. Its totient is φ = 19052092800.

The previous prime is 20648718617. The next prime is 20648718641. The reversal of 20648718623 is 32681784602.

It is not a de Polignac number, because 20648718623 - 2⁸ = 20648718367 is a prime.

It is a super-2 number, since 2×20648718623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648718613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 383198 + ... + 433748.

It is an arithmetic number, because the mean of its divisors is an integer number (1864079724).

Almost surely, 2^20648718623 is an apocalyptic number.

20648718623 is a deficient number, since it is larger than the sum of its proper divisors (1720238065).

20648718623 is a wasteful number, since it uses less digits than its factorization.

20648718623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52994 (or 52981 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 20648718623 in words is "twenty billion, six hundred forty-eight million, seven hundred eighteen thousand, six hundred twenty-three".