20563151644 has 36 divisors (see below), whose sum is σ = 42881711040. Its totient is φ = 8597830080.

The previous prime is 20563151627. The next prime is 20563151681. The reversal of 20563151644 is 44615136502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1271404 + ... + 1287475.

It is an arithmetic number, because the mean of its divisors is an integer number (1191158640).

Almost surely, 2^20563151644 is an apocalyptic number.

It is an amenable number.

20563151644 is an abundant number, since it is smaller than the sum of its proper divisors (22318559396).

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

20563151644 is a wasteful number, since it uses less digits than its factorization.

20563151644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558938 (or 2558929 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 20563151644 in words is "twenty billion, five hundred sixty-three million, one hundred fifty-one thousand, six hundred forty-four".