20808949 has 8 divisors (see below), whose sum is σ = 23822208. Its totient is φ = 17805840.

The previous prime is 20808943. The next prime is 20808989. The reversal of 20808949 is 94980802.

It is a happy number.

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 20808949 - 2²³ = 12420341 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 (20808943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2544 + ... + 6934.

It is an arithmetic number, because the mean of its divisors is an integer number (2977776).

Almost surely, 2^20808949 is an apocalyptic number.

It is an amenable number.

20808949 is a deficient number, since it is larger than the sum of its proper divisors (3013259).

20808949 is an equidigital number, since it uses as much as digits as its factorization.

20808949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5075.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 20808949 is about 4561.6826939190. The cubic root of 20808949 is about 275.0532084371.

The spelling of 20808949 in words is "twenty million, eight hundred eight thousand, nine hundred forty-nine".