20747671 has 4 divisors (see below), whose sum is σ = 23711632. Its totient is φ = 17783712.

The previous prime is 20747663. The next prime is 20747719. The reversal of 20747671 is 17674702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17674702 = 2 ⋅8837351.

It is a cyclic number.

It is not a de Polignac number, because 20747671 - 2³ = 20747663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747641) 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, 1481970 + ... + 1481983.

It is an arithmetic number, because the mean of its divisors is an integer number (5927908).

Almost surely, 2^20747671 is an apocalyptic number.

20747671 is a deficient number, since it is larger than the sum of its proper divisors (2963961).

20747671 is an equidigital number, since it uses as much as digits as its factorization.

20747671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2963960.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 20747671 is about 4554.9611414369. The cubic root of 20747671 is about 274.7829516010.

The spelling of 20747671 in words is "twenty million, seven hundred forty-seven thousand, six hundred seventy-one".