20508097 has 4 divisors (see below), whose sum is σ = 20814256. Its totient is φ = 20201940.

The previous prime is 20508083. The next prime is 20508113. The reversal of 20508097 is 79080502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20508097 - 2⁷ = 20507969 is a prime.

It is a super-2 number, since 2×20508097² = 841164085122818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20508197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152979 + ... + 153112.

It is an arithmetic number, because the mean of its divisors is an integer number (5203564).

Almost surely, 2^20508097 is an apocalyptic number.

It is an amenable number.

20508097 is a deficient number, since it is larger than the sum of its proper divisors (306159).

20508097 is an equidigital number, since it uses as much as digits as its factorization.

20508097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306158.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 20508097 is about 4528.5866448595. The cubic root of 20508097 is about 273.7212119877.

Adding to 20508097 its reverse (79080502), we get a palindrome (99588599).

The spelling of 20508097 in words is "twenty million, five hundred eight thousand, ninety-seven".