20643914754 has 96 divisors (see below), whose sum is σ = 47588276736. Its totient is φ = 6456257280.

The previous prime is 20643914747. The next prime is 20643914821. The reversal of 20643914754 is 45741934602.

20643914754 is a `hidden beast` number, since 20 + 6 + 439 + 147 + 54 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6336694 + ... + 6339950.

It is an arithmetic number, because the mean of its divisors is an integer number (495711216).

Almost surely, 2^20643914754 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20643914754, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23794138368).

20643914754 is an abundant number, since it is smaller than the sum of its proper divisors (26944361982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20643914754 is a wasteful number, since it uses less digits than its factorization.

20643914754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640 (or 3637 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 20643914754 in words is "twenty billion, six hundred forty-three million, nine hundred fourteen thousand, seven hundred fifty-four".