20732671 has 4 divisors (see below), whose sum is σ = 20755512. Its totient is φ = 20709832.

The previous prime is 20732627. The next prime is 20732689. The reversal of 20732671 is 17623702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17623702 = 2 ⋅8811851.

It is a cyclic number.

It is not a de Polignac number, because 20732671 - 2¹¹ = 20730623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20732611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10000 + ... + 11893.

It is an arithmetic number, because the mean of its divisors is an integer number (5188878).

Almost surely, 2^20732671 is an apocalyptic number.

20732671 is a deficient number, since it is larger than the sum of its proper divisors (22841).

20732671 is an equidigital number, since it uses as much as digits as its factorization.

20732671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22840.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20732671 is about 4553.3142874175. The cubic root of 20732671 is about 274.7167154440.

The spelling of 20732671 in words is "twenty million, seven hundred thirty-two thousand, six hundred seventy-one".