20647044 has 72 divisors (see below), whose sum is σ = 60304608. Its totient is φ = 5886720.

The previous prime is 20647019. The next prime is 20647049. The reversal of 20647044 is 44074602.

It is a junction number, because it is equal to n+sod(n) for n = 20646999 and 20647017.

It is not an unprimeable number, because it can be changed into a prime (20647049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5199 + ... + 8265.

It is an arithmetic number, because the mean of its divisors is an integer number (837564).

Almost surely, 2^20647044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20647044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30152304).

20647044 is an abundant number, since it is smaller than the sum of its proper divisors (39657564).

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

20647044 is a wasteful number, since it uses less digits than its factorization.

20647044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105 (or 3100 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 20647044 is about 4543.9018475315. The cubic root of 20647044 is about 274.3379955215.

The spelling of 20647044 in words is "twenty million, six hundred forty-seven thousand, forty-four".