20571371 has 8 divisors (see below), whose sum is σ = 21368160. Its totient is φ = 19787328.

The previous prime is 20571359. The next prime is 20571379. The reversal of 20571371 is 17317502.

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

It is a cyclic number.

It is not a de Polignac number, because 20571371 - 2⁶ = 20571307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20571371.

It is not an unprimeable number, because it can be changed into a prime (20571379) 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, 170 + ... + 6416.

It is an arithmetic number, because the mean of its divisors is an integer number (2671020).

Almost surely, 2^20571371 is an apocalyptic number.

20571371 is a deficient number, since it is larger than the sum of its proper divisors (796789).

20571371 is an equidigital number, since it uses as much as digits as its factorization.

20571371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6373.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 20571371 is about 4535.5673294528. The cubic root of 20571371 is about 274.0024286286.

Adding to 20571371 its reverse (17317502), we get a palindrome (37888873).

The spelling of 20571371 in words is "twenty million, five hundred seventy-one thousand, three hundred seventy-one".