20508353 has 8 divisors (see below), whose sum is σ = 21803520. Its totient is φ = 19234800.

The previous prime is 20508349. The next prime is 20508379. The reversal of 20508353 is 35380502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20508353 - 2² = 20508349 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20508053) 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 7 ways as a sum of consecutive naturals, for example, 3425 + ... + 7262.

It is an arithmetic number, because the mean of its divisors is an integer number (2725440).

Almost surely, 2^20508353 is an apocalyptic number.

It is an amenable number.

20508353 is a deficient number, since it is larger than the sum of its proper divisors (1295167).

20508353 is a wasteful number, since it uses less digits than its factorization.

20508353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10807.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20508353 is about 4528.6149096606. The cubic root of 20508353 is about 273.7223509255.

Adding to 20508353 its reverse (35380502), we get a palindrome (55888855).

The spelling of 20508353 in words is "twenty million, five hundred eight thousand, three hundred fifty-three".