20644173424 has 40 divisors (see below), whose sum is σ = 45850283648. Its totient is φ = 8820757440.

The previous prime is 20644173419. The next prime is 20644173427. The reversal of 20644173424 is 42437144602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644173427) 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, 241362 + ... + 315505.

Almost surely, 2^20644173424 is an apocalyptic number.

It is an amenable number.

20644173424 is an abundant number, since it is smaller than the sum of its proper divisors (25206110224).

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

20644173424 is a wasteful number, since it uses less digits than its factorization.

20644173424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557213 (or 557207 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 37.

The spelling of 20644173424 in words is "twenty billion, six hundred forty-four million, one hundred seventy-three thousand, four hundred twenty-four".