20565242 has 8 divisors (see below), whose sum is σ = 31219776. Its totient is φ = 10158652.

The previous prime is 20565211. The next prime is 20565247. The reversal of 20565242 is 24256502.

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

It is not an unprimeable number, because it can be changed into a prime (20565247) 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, 61778 + ... + 62109.

It is an arithmetic number, because the mean of its divisors is an integer number (3902472).

Almost surely, 2^20565242 is an apocalyptic number.

20565242 is a deficient number, since it is larger than the sum of its proper divisors (10654534).

20565242 is a wasteful number, since it uses less digits than its factorization.

20565242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123972.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20565242 is about 4534.8916194326. The cubic root of 20565242 is about 273.9752139833.

The spelling of 20565242 in words is "twenty million, five hundred sixty-five thousand, two hundred forty-two".