20671071 has 8 divisors (see below), whose sum is σ = 27633840. Its totient is φ = 13744512.

The previous prime is 20671033. The next prime is 20671073. The reversal of 20671071 is 17017602.

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

It is not a de Polignac number, because 20671071 - 2⁷ = 20670943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20671073) 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, 7690 + ... + 10023.

It is an arithmetic number, because the mean of its divisors is an integer number (3454230).

Almost surely, 2^20671071 is an apocalyptic number.

20671071 is a deficient number, since it is larger than the sum of its proper divisors (6962769).

20671071 is a wasteful number, since it uses less digits than its factorization.

20671071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18105.

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 20671071 is about 4546.5449519388. The cubic root of 20671071 is about 274.4443701324. Note that the first 3 decimals are identical.

Adding to 20671071 its reverse (17017602), we get a palindrome (37688673).

The spelling of 20671071 in words is "twenty million, six hundred seventy-one thousand, seventy-one".