20671539 has 8 divisors (see below), whose sum is σ = 31499520. Its totient is φ = 11812296.

The previous prime is 20671531. The next prime is 20671543. The reversal of 20671539 is 93517602.

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

It is not a de Polignac number, because 20671539 - 2³ = 20671531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20671531) 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, 492159 + ... + 492200.

It is an arithmetic number, because the mean of its divisors is an integer number (3937440).

Almost surely, 2^20671539 is an apocalyptic number.

20671539 is a deficient number, since it is larger than the sum of its proper divisors (10827981).

20671539 is an equidigital number, since it uses as much as digits as its factorization.

20671539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984369.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 20671539 is about 4546.5964193009. The cubic root of 20671539 is about 274.4464412877.

The spelling of 20671539 in words is "twenty million, six hundred seventy-one thousand, five hundred thirty-nine".