20512544 has 36 divisors (see below), whose sum is σ = 43741026. Its totient is φ = 9464832.

The previous prime is 20512543. The next prime is 20512561. The reversal of 20512544 is 44521502.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6822544 + 13690000 = 2612^2 + 3700^2 .

It is a super-2 number, since 2×20512544² = 841528922703872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20512543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3512 + ... + 7304.

Almost surely, 2^20512544 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 20512544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21870513).

20512544 is an abundant number, since it is smaller than the sum of its proper divisors (23228482).

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

20512544 is a wasteful number, since it uses less digits than its factorization.

20512544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829 (or 3808 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 20512544 is about 4529.0776102867. The cubic root of 20512544 is about 273.7409952349.

The spelling of 20512544 in words is "twenty million, five hundred twelve thousand, five hundred forty-four".