20512136 has 32 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 9567360.

The previous prime is 20512087. The next prime is 20512139. The reversal of 20512136 is 63121502.

It is not an unprimeable number, because it can be changed into a prime (20512139) 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 7 ways as a sum of consecutive naturals, for example, 6185 + ... + 8903.

It is an arithmetic number, because the mean of its divisors is an integer number (1285200).

Almost surely, 2^20512136 is an apocalyptic number.

It is an amenable number.

20512136 is an abundant number, since it is smaller than the sum of its proper divisors (20614264).

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

20512136 is a wasteful number, since it uses less digits than its factorization.

20512136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20512136 is about 4529.0325677787. The cubic root of 20512136 is about 273.7391802956.

Adding to 20512136 its reverse (63121502), we get a palindrome (83633638).

The spelling of 20512136 in words is "twenty million, five hundred twelve thousand, one hundred thirty-six".