20442645544 has 16 divisors (see below), whose sum is σ = 38338646400. Its totient is φ = 10219006512.

The previous prime is 20442645541. The next prime is 20442645581. The reversal of 20442645544 is 44554624402.

It is a junction number, because it is equal to n+sod(n) for n = 20442645497 and 20442645506.

It is not an unprimeable number, because it can be changed into a prime (20442645541) 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, 251734 + ... + 322885.

It is an arithmetic number, because the mean of its divisors is an integer number (2396165400).

Almost surely, 2^20442645544 is an apocalyptic number.

It is an amenable number.

20442645544 is a deficient number, since it is larger than the sum of its proper divisors (17896000856).

20442645544 is a wasteful number, since it uses less digits than its factorization.

20442645544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579072 (or 579068 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 40.

The spelling of 20442645544 in words is "twenty billion, four hundred forty-two million, six hundred forty-five thousand, five hundred forty-four".