20597671 has 4 divisors (see below), whose sum is σ = 21262144. Its totient is φ = 19933200.

The previous prime is 20597669. The next prime is 20597699. The reversal of 20597671 is 17679502.

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 20597671 - 2¹ = 20597669 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 20597671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20597651) 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, 332190 + ... + 332251.

It is an arithmetic number, because the mean of its divisors is an integer number (5315536).

Almost surely, 2^20597671 is an apocalyptic number.

20597671 is a deficient number, since it is larger than the sum of its proper divisors (664473).

20597671 is an equidigital number, since it uses as much as digits as its factorization.

20597671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664472.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 20597671 is about 4538.4657099068. The cubic root of 20597671 is about 274.1191473934.

It can be divided in two parts, 2059 and 7671, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 20597671 in words is "twenty million, five hundred ninety-seven thousand, six hundred seventy-one".