20643116144 has 40 divisors (see below), whose sum is σ = 45766320768. Its totient is φ = 8836102080.

The previous prime is 20643116141. The next prime is 20643116171. The reversal of 20643116144 is 44161134602.

It is a super-2 number, since 2×20643116144² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20643116144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643116141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22802 + ... + 204465.

Almost surely, 2^20643116144 is an apocalyptic number.

It is an amenable number.

20643116144 is an abundant number, since it is smaller than the sum of its proper divisors (25123204624).

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

20643116144 is a wasteful number, since it uses less digits than its factorization.

20643116144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228093 (or 228087 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 20643116144 in words is "twenty billion, six hundred forty-three million, one hundred sixteen thousand, one hundred forty-four".