20808753 has 8 divisors (see below), whose sum is σ = 31708608. Its totient is φ = 11890704.

The previous prime is 20808737. The next prime is 20808761. The reversal of 20808753 is 35780802.

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

It is not a de Polignac number, because 20808753 - 2⁴ = 20808737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20808703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495426 + ... + 495467.

It is an arithmetic number, because the mean of its divisors is an integer number (3963576).

Almost surely, 2^20808753 is an apocalyptic number.

It is an amenable number.

20808753 is a deficient number, since it is larger than the sum of its proper divisors (10899855).

20808753 is an equidigital number, since it uses as much as digits as its factorization.

20808753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990903.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20808753 is about 4561.6612105679. The cubic root of 20808753 is about 275.0523448567.

The spelling of 20808753 in words is "twenty million, eight hundred eight thousand, seven hundred fifty-three".