20956844 has 6 divisors (see below), whose sum is σ = 36674484. Its totient is φ = 10478420.

The previous prime is 20956843. The next prime is 20956853. The reversal of 20956844 is 44865902.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 20956798 and 20956807.

It is not an unprimeable number, because it can be changed into a prime (20956843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2619602 + ... + 2619609.

It is an arithmetic number, because the mean of its divisors is an integer number (6112414).

Almost surely, 2^20956844 is an apocalyptic number.

It is an amenable number.

20956844 is a deficient number, since it is larger than the sum of its proper divisors (15717640).

20956844 is a wasteful number, since it uses less digits than its factorization.

20956844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5239215 (or 5239213 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 20956844 is about 4577.8645676778. The cubic root of 20956844 is about 275.7032973432.

The spelling of 20956844 in words is "twenty million, nine hundred fifty-six thousand, eight hundred forty-four".