20939271 has 8 divisors (see below), whose sum is σ = 28026240. Its totient is φ = 13905912.

The previous prime is 20939267. The next prime is 20939279. The reversal of 20939271 is 17293902.

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

It is not a de Polignac number, because 20939271 - 2² = 20939267 is a prime.

It is a super-2 number, since 2×20939271² = 876906140022882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939279) 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, 12481 + ... + 14058.

It is an arithmetic number, because the mean of its divisors is an integer number (3503280).

Almost surely, 2^20939271 is an apocalyptic number.

20939271 is a deficient number, since it is larger than the sum of its proper divisors (7086969).

20939271 is a wasteful number, since it uses less digits than its factorization.

20939271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26805.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 20939271 is about 4575.9448204715. The cubic root of 20939271 is about 275.6262137122.

The spelling of 20939271 in words is "twenty million, nine hundred thirty-nine thousand, two hundred seventy-one".