20272151 has 4 divisors (see below), whose sum is σ = 20469072. Its totient is φ = 20075232.

The previous prime is 20272117. The next prime is 20272157. The reversal of 20272151 is 15127202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15127202 = 2 ⋅7563601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20272151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20272157) 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, 98306 + ... + 98511.

It is an arithmetic number, because the mean of its divisors is an integer number (5117268).

Almost surely, 2^20272151 is an apocalyptic number.

20272151 is a deficient number, since it is larger than the sum of its proper divisors (196921).

20272151 is a wasteful number, since it uses less digits than its factorization.

20272151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196920.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20272151 is about 4502.4605495218. The cubic root of 20272151 is about 272.6674379881.

Adding to 20272151 its reverse (15127202), we get a palindrome (35399353).

The spelling of 20272151 in words is "twenty million, two hundred seventy-two thousand, one hundred fifty-one".