20540052 has 36 divisors (see below), whose sum is σ = 55915860. Its totient is φ = 6319872.

The previous prime is 20540017. The next prime is 20540053. The reversal of 20540052 is 25004502.

It can be written as a sum of positive squares in 2 ways, for example, as 11861136 + 8678916 = 3444^2 + 2946^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21477 + ... + 22412.

Almost surely, 2^20540052 is an apocalyptic number.

It is an amenable number.

20540052 is an abundant number, since it is smaller than the sum of its proper divisors (35375808).

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

20540052 is a wasteful number, since it uses less digits than its factorization.

20540052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43912 (or 43907 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20540052 is about 4532.1134142914. The cubic root of 20540052 is about 273.8633058201.

Adding to 20540052 its reverse (25004502), we get a palindrome (45544554).

The spelling of 20540052 in words is "twenty million, five hundred forty thousand, fifty-two".