20947371 has 4 divisors (see below), whose sum is σ = 27929832. Its totient is φ = 13964912.

The previous prime is 20947363. The next prime is 20947387. The reversal of 20947371 is 17374902.

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 20947371 - 2³ = 20947363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20947361) 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, 3491226 + ... + 3491231.

It is an arithmetic number, because the mean of its divisors is an integer number (6982458).

Almost surely, 2^20947371 is an apocalyptic number.

20947371 is a deficient number, since it is larger than the sum of its proper divisors (6982461).

20947371 is an equidigital number, since it uses as much as digits as its factorization.

20947371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6982460.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20947371 is about 4576.8297980152. The cubic root of 20947371 is about 275.6617495643.

The spelling of 20947371 in words is "twenty million, nine hundred forty-seven thousand, three hundred seventy-one".