20775949 has 8 divisors (see below), whose sum is σ = 22178880. Its totient is φ = 19404000.

The previous prime is 20775943. The next prime is 20775959. The reversal of 20775949 is 94957702.

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 20775949 - 2³ = 20775941 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 (20775941) 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, 6352 + ... + 9049.

It is an arithmetic number, because the mean of its divisors is an integer number (2772360).

Almost surely, 2^20775949 is an apocalyptic number.

It is an amenable number.

20775949 is a deficient number, since it is larger than the sum of its proper divisors (1402931).

20775949 is a wasteful number, since it uses less digits than its factorization.

20775949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15491.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 20775949 is about 4558.0641724311. The cubic root of 20775949 is about 274.9077332339.

The spelling of 20775949 in words is "twenty million, seven hundred seventy-five thousand, nine hundred forty-nine".