20044864 has 56 divisors (see below), whose sum is σ = 46012608. Its totient is φ = 8486400.

The previous prime is 20044841. The next prime is 20044873. The reversal of 20044864 is 46844002.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-3 number, since 3×20044864³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45027 + ... + 45469.

Almost surely, 2^20044864 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 20044864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23006304).

20044864 is an abundant number, since it is smaller than the sum of its proper divisors (25967744).

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

20044864 is a wasteful number, since it uses less digits than its factorization.

20044864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 20044864 is about 4477.1490928938. The cubic root of 20044864 is about 271.6445761371.

Adding to 20044864 its reverse (46844002), we get a palindrome (66888866).

The spelling of 20044864 in words is "twenty million, forty-four thousand, eight hundred sixty-four".