20539117 has 2 divisors, whose sum is σ = 20539118. Its totient is φ = 20539116.

The previous prime is 20539109. The next prime is 20539121. The reversal of 20539117 is 71193502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20241001 + 298116 = 4499^2 + 546^2 .

It is a cyclic number.

It is not a de Polignac number, because 20539117 - 2³ = 20539109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20539157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269558 + 10269559.

It is an arithmetic number, because the mean of its divisors is an integer number (10269559).

Almost surely, 2^20539117 is an apocalyptic number.

It is an amenable number.

20539117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20539117 is an equidigital number, since it uses as much as digits as its factorization.

20539117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 20539117 is about 4532.0102603591. The cubic root of 20539117 is about 273.8591502630.

The spelling of 20539117 in words is "twenty million, five hundred thirty-nine thousand, one hundred seventeen".