20542999 has 2 divisors, whose sum is σ = 20543000. Its totient is φ = 20542998.

The previous prime is 20542997. The next prime is 20543051. The reversal of 20542999 is 99924502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20542999 - 2¹ = 20542997 is a prime.

Together with 20542997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20542993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271499 + 10271500.

It is an arithmetic number, because the mean of its divisors is an integer number (10271500).

Almost surely, 2^20542999 is an apocalyptic number.

20542999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542999 is an equidigital number, since it uses as much as digits as its factorization.

20542999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 20542999 is about 4532.4385268859. The cubic root of 20542999 is about 273.8764027776.

The spelling of 20542999 in words is "twenty million, five hundred forty-two thousand, nine hundred ninety-nine".