20508107 has 4 divisors (see below), whose sum is σ = 20517696. Its totient is φ = 20498520.

The previous prime is 20508083. The next prime is 20508113. The reversal of 20508107 is 70180502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20508107 - 2⁶ = 20508043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20508167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38 + ... + 6404.

It is an arithmetic number, because the mean of its divisors is an integer number (5129424).

Almost surely, 2^20508107 is an apocalyptic number.

20508107 is a deficient number, since it is larger than the sum of its proper divisors (9589).

20508107 is an equidigital number, since it uses as much as digits as its factorization.

20508107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9588.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 20508107 is about 4528.5877489566. The cubic root of 20508107 is about 273.7212564776.

Adding to 20508107 its reverse (70180502), we get a palindrome (90688609).

The spelling of 20508107 in words is "twenty million, five hundred eight thousand, one hundred seven".