20508373 has 4 divisors (see below), whose sum is σ = 20614828. Its totient is φ = 20401920.

The previous prime is 20508349. The next prime is 20508379. The reversal of 20508373 is 37380502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1350244 + 19158129 = 1162^2 + 4377^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20508373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508379) 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, 52938 + ... + 53323.

It is an arithmetic number, because the mean of its divisors is an integer number (5153707).

Almost surely, 2^20508373 is an apocalyptic number.

It is an amenable number.

20508373 is a deficient number, since it is larger than the sum of its proper divisors (106455).

20508373 is a wasteful number, since it uses less digits than its factorization.

20508373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106454.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20508373 is about 4528.6171178407. The cubic root of 20508373 is about 273.7224399046.

Adding to 20508373 its reverse (37380502), we get a palindrome (57888875).

The spelling of 20508373 in words is "twenty million, five hundred eight thousand, three hundred seventy-three".