20542965 has 8 divisors (see below), whose sum is σ = 32868768. Its totient is φ = 10956240.

The previous prime is 20542961. The next prime is 20542967. The reversal of 20542965 is 56924502.

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

It is not a de Polignac number, because 20542965 - 2² = 20542961 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542961) 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, 684751 + ... + 684780.

It is an arithmetic number, because the mean of its divisors is an integer number (4108596).

Almost surely, 2^20542965 is an apocalyptic number.

It is an amenable number.

20542965 is a deficient number, since it is larger than the sum of its proper divisors (12325803).

20542965 is a wasteful number, since it uses less digits than its factorization.

20542965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369539.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 20542965 is about 4532.4347761441. The cubic root of 20542965 is about 273.8762516831.

The spelling of 20542965 in words is "twenty million, five hundred forty-two thousand, nine hundred sixty-five".