20957271 has 8 divisors (see below), whose sum is σ = 28844544. Its totient is φ = 13520760.

The previous prime is 20957263. The next prime is 20957303. The reversal of 20957271 is 17275902.

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

It is not a de Polignac number, because 20957271 - 2³ = 20957263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112581 + ... + 112766.

It is an arithmetic number, because the mean of its divisors is an integer number (3605568).

Almost surely, 2^20957271 is an apocalyptic number.

20957271 is a deficient number, since it is larger than the sum of its proper divisors (7887273).

20957271 is a wasteful number, since it uses less digits than its factorization.

20957271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225381.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 20957271 is about 4577.9112049056. The cubic root of 20957271 is about 275.7051698342.

The spelling of 20957271 in words is "twenty million, nine hundred fifty-seven thousand, two hundred seventy-one".