20957227 has 4 divisors (see below), whose sum is σ = 21679920. Its totient is φ = 20234536.

The previous prime is 20957219. The next prime is 20957231. The reversal of 20957227 is 72275902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20957227 - 2³ = 20957219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20957192 and 20957201.

It is not an unprimeable number, because it can be changed into a prime (20957327) 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, 361303 + ... + 361360.

It is an arithmetic number, because the mean of its divisors is an integer number (5419980).

Almost surely, 2^20957227 is an apocalyptic number.

20957227 is a deficient number, since it is larger than the sum of its proper divisors (722693).

20957227 is an equidigital number, since it uses as much as digits as its factorization.

20957227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722692.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20957227 is about 4577.9063992179. The cubic root of 20957227 is about 275.7049768855.

The spelling of 20957227 in words is "twenty million, nine hundred fifty-seven thousand, two hundred twenty-seven".