20430671 has 4 divisors (see below), whose sum is σ = 20440200. Its totient is φ = 20421144.

The previous prime is 20430659. The next prime is 20430679. The reversal of 20430671 is 17603402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20430671 - 2⁶ = 20430607 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 (20430679) 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, 125 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (5110050).

Almost surely, 2^20430671 is an apocalyptic number.

20430671 is a deficient number, since it is larger than the sum of its proper divisors (9529).

20430671 is an equidigital number, since it uses as much as digits as its factorization.

20430671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9528.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20430671 is about 4520.0299777767. The cubic root of 20430671 is about 273.3763097538.

The spelling of 20430671 in words is "twenty million, four hundred thirty thousand, six hundred seventy-one".