20016539 has 2 divisors, whose sum is σ = 20016540. Its totient is φ = 20016538.

The previous prime is 20016523. The next prime is 20016541. The reversal of 20016539 is 93561002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20016539 - 2⁴ = 20016523 is a prime.

Together with 20016541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20016589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008269 + 10008270.

It is an arithmetic number, because the mean of its divisors is an integer number (10008270).

Almost surely, 2^20016539 is an apocalyptic number.

20016539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20016539 is an equidigital number, since it uses as much as digits as its factorization.

20016539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20016539 is about 4473.9846892899. The cubic root of 20016539 is about 271.5165639656.

The spelling of 20016539 in words is "twenty million, sixteen thousand, five hundred thirty-nine".