20036864 has 72 divisors (see below), whose sum is σ = 43267392. Its totient is φ = 9236480.

The previous prime is 20036851. The next prime is 20036879. The reversal of 20036864 is 46863002.

It is a congruent number.

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, 241367 + ... + 241449.

It is an arithmetic number, because the mean of its divisors is an integer number (600936).

Almost surely, 2^20036864 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 20036864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21633696).

20036864 is an abundant number, since it is smaller than the sum of its proper divisors (23230528).

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

20036864 is an equidigital number, since it uses as much as digits as its factorization.

20036864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20036864 is about 4476.2555780473. The cubic root of 20036864 is about 271.6084331168.

Adding to 20036864 its reverse (46863002), we get a palindrome (66899866).

The spelling of 20036864 in words is "twenty million, thirty-six thousand, eight hundred sixty-four".