20015136 has 36 divisors (see below), whose sum is σ = 56918862. Its totient is φ = 6671616.

The previous prime is 20015131. The next prime is 20015143. The reversal of 20015136 is 63151002.

It can be written as a sum of positive squares in only one way, i.e., 18974736 + 1040400 = 4356^2 + 1020^2 .

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 not an unprimeable number, because it can be changed into a prime (20015131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34461 + ... + 35036.

Almost surely, 2^20015136 is an apocalyptic number.

It is an amenable number.

20015136 is an abundant number, since it is smaller than the sum of its proper divisors (36903726).

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

20015136 is a wasteful number, since it uses less digits than its factorization.

20015136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69513 (or 69502 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20015136 is about 4473.8278911912. The cubic root of 20015136 is about 271.5102201010.

Adding to 20015136 its reverse (63151002), we get a palindrome (83166138).

The spelling of 20015136 in words is "twenty million, fifteen thousand, one hundred thirty-six".