20272691 has 4 divisors (see below), whose sum is σ = 20296584. Its totient is φ = 20248800.

The previous prime is 20272663. The next prime is 20272699. The reversal of 20272691 is 19627202.

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-20272691 is a prime.

It is a super-3 number, since 3×20272691³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20272699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10625 + ... + 12386.

It is an arithmetic number, because the mean of its divisors is an integer number (5074146).

Almost surely, 2^20272691 is an apocalyptic number.

20272691 is a deficient number, since it is larger than the sum of its proper divisors (23893).

20272691 is an equidigital number, since it uses as much as digits as its factorization.

20272691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23892.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20272691 is about 4502.5205163330. The cubic root of 20272691 is about 272.6698590288.

Adding to 20272691 its reverse (19627202), we get a palindrome (39899893).

The spelling of 20272691 in words is "twenty million, two hundred seventy-two thousand, six hundred ninety-one".