20956233 has 8 divisors (see below), whose sum is σ = 28127296. Its totient is φ = 13878000.

The previous prime is 20956211. The next prime is 20956261. The reversal of 20956233 is 33265902.

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

It is not a de Polignac number, because 20956233 - 2²² = 16761929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20956233.

It is not an unprimeable number, because it can be changed into a prime (20956283) 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, 22678 + ... + 23583.

It is an arithmetic number, because the mean of its divisors is an integer number (3515912).

Almost surely, 2^20956233 is an apocalyptic number.

It is an amenable number.

20956233 is a deficient number, since it is larger than the sum of its proper divisors (7171063).

20956233 is a wasteful number, since it uses less digits than its factorization.

20956233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46415.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 20956233 is about 4577.7978330197. The cubic root of 20956233 is about 275.7006179265.

The spelling of 20956233 in words is "twenty million, nine hundred fifty-six thousand, two hundred thirty-three".