20045136 has 40 divisors (see below), whose sum is σ = 52094880. Its totient is φ = 6641536.

The previous prime is 20045131. The next prime is 20045161. The reversal of 20045136 is 63154002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7426 + ... + 9758.

It is an arithmetic number, because the mean of its divisors is an integer number (1302372).

Almost surely, 2^20045136 is an apocalyptic number.

It is an amenable number.

20045136 is an abundant number, since it is smaller than the sum of its proper divisors (32049744).

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

20045136 is a wasteful number, since it uses less digits than its factorization.

20045136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523 (or 2517 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20045136 is about 4477.1794692641. The cubic root of 20045136 is about 271.6458048307.

Adding to 20045136 its reverse (63154002), we get a palindrome (83199138).

It can be divided in two parts, 2004 and 5136, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 20045136 in words is "twenty million, forty-five thousand, one hundred thirty-six".