20536637 has 4 divisors (see below), whose sum is σ = 22403616. Its totient is φ = 18669660.

The previous prime is 20536627. The next prime is 20536643. The reversal of 20536637 is 73663502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20536637 - 2⁸ = 20536381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20536627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933473 + ... + 933494.

It is an arithmetic number, because the mean of its divisors is an integer number (5600904).

Almost surely, 2^20536637 is an apocalyptic number.

It is an amenable number.

20536637 is a deficient number, since it is larger than the sum of its proper divisors (1866979).

20536637 is a wasteful number, since it uses less digits than its factorization.

20536637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866978.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 20536637 is about 4531.7366428335. The cubic root of 20536637 is about 273.8481274257.

The spelling of 20536637 in words is "twenty million, five hundred thirty-six thousand, six hundred thirty-seven".