20708353 has 4 divisors (see below), whose sum is σ = 20771248. Its totient is φ = 20645460.

The previous prime is 20708323. The next prime is 20708377. The reversal of 20708353 is 35380702.

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 20708353 - 2¹⁷ = 20577281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20708323) 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, 30951 + ... + 31612.

It is an arithmetic number, because the mean of its divisors is an integer number (5192812).

Almost surely, 2^20708353 is an apocalyptic number.

It is an amenable number.

20708353 is a deficient number, since it is larger than the sum of its proper divisors (62895).

20708353 is an equidigital number, since it uses as much as digits as its factorization.

20708353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62894.

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

The square root of 20708353 is about 4550.6431413593. The cubic root of 20708353 is about 274.6092654724.

The spelling of 20708353 in words is "twenty million, seven hundred eight thousand, three hundred fifty-three".