20872271 has 4 divisors (see below), whose sum is σ = 23854032. Its totient is φ = 17890512.

The previous prime is 20872261. The next prime is 20872273. The reversal of 20872271 is 17227802.

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-20872271 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 (20872273) 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, 1490870 + ... + 1490883.

It is an arithmetic number, because the mean of its divisors is an integer number (5963508).

Almost surely, 2^20872271 is an apocalyptic number.

20872271 is a deficient number, since it is larger than the sum of its proper divisors (2981761).

20872271 is an equidigital number, since it uses as much as digits as its factorization.

20872271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981760.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20872271 is about 4568.6180623904. The cubic root of 20872271 is about 275.3319231767.

The spelling of 20872271 in words is "twenty million, eight hundred seventy-two thousand, two hundred seventy-one".