20542136 has 8 divisors (see below), whose sum is σ = 38516520. Its totient is φ = 10271064.

The previous prime is 20542099. The next prime is 20542153. The reversal of 20542136 is 63124502.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1283876 + ... + 1283891.

It is an arithmetic number, because the mean of its divisors is an integer number (4814565).

Almost surely, 2^20542136 is an apocalyptic number.

It is an amenable number.

20542136 is a deficient number, since it is larger than the sum of its proper divisors (17974384).

20542136 is a wasteful number, since it uses less digits than its factorization.

20542136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567773 (or 2567769 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20542136 is about 4532.3433232711. The cubic root of 20542136 is about 273.8725675919.

Adding to 20542136 its reverse (63124502), we get a palindrome (83666638).

The spelling of 20542136 in words is "twenty million, five hundred forty-two thousand, one hundred thirty-six".