20272571 has 4 divisors (see below), whose sum is σ = 22115544. Its totient is φ = 18429600.

The previous prime is 20272561. The next prime is 20272589. The reversal of 20272571 is 17527202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20272571 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20272571.

It is not an unprimeable number, because it can be changed into a prime (20272561) 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, 921470 + ... + 921491.

It is an arithmetic number, because the mean of its divisors is an integer number (5528886).

Almost surely, 2^20272571 is an apocalyptic number.

20272571 is a deficient number, since it is larger than the sum of its proper divisors (1842973).

20272571 is a wasteful number, since it uses less digits than its factorization.

20272571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842972.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20272571 is about 4502.5071904440. The cubic root of 20272571 is about 272.6693210234.

Adding to 20272571 its reverse (17527202), we get a palindrome (37799773).

The spelling of 20272571 in words is "twenty million, two hundred seventy-two thousand, five hundred seventy-one".