20636745 has 8 divisors (see below), whose sum is σ = 33018816. Its totient is φ = 11006256.

The previous prime is 20636741. The next prime is 20636753. The reversal of 20636745 is 54763602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20636745 - 2² = 20636741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20636741) 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, 687877 + ... + 687906.

It is an arithmetic number, because the mean of its divisors is an integer number (4127352).

Almost surely, 2^20636745 is an apocalyptic number.

It is an amenable number.

20636745 is a deficient number, since it is larger than the sum of its proper divisors (12382071).

20636745 is a wasteful number, since it uses less digits than its factorization.

20636745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375791.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 20636745 is about 4542.7684290529. The cubic root of 20636745 is about 274.2923735440.

The spelling of 20636745 in words is "twenty million, six hundred thirty-six thousand, seven hundred forty-five".