20249539 has 2 divisors, whose sum is σ = 20249540. Its totient is φ = 20249538.

The previous prime is 20249519. The next prime is 20249557. The reversal of 20249539 is 93594202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20249539 - 2¹⁷ = 20118467 is a prime.

It is a super-3 number, since 3×20249539³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20249519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10124769 + 10124770.

It is an arithmetic number, because the mean of its divisors is an integer number (10124770).

Almost surely, 2^20249539 is an apocalyptic number.

20249539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20249539 is an equidigital number, since it uses as much as digits as its factorization.

20249539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20249539 is about 4499.9487774863. The cubic root of 20249539 is about 272.5660205324.

The spelling of 20249539 in words is "twenty million, two hundred forty-nine thousand, five hundred thirty-nine".