20775956 has 6 divisors (see below), whose sum is σ = 36357930. Its totient is φ = 10387976.

The previous prime is 20775943. The next prime is 20775959. The reversal of 20775956 is 65957702.

It can be written as a sum of positive squares in only one way, i.e., 16532356 + 4243600 = 4066^2 + 2060^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2596991 + ... + 2596998.

It is an arithmetic number, because the mean of its divisors is an integer number (6059655).

Almost surely, 2^20775956 is an apocalyptic number.

It is an amenable number.

20775956 is a deficient number, since it is larger than the sum of its proper divisors (15581974).

20775956 is a wasteful number, since it uses less digits than its factorization.

20775956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5193993 (or 5193991 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 41.

The square root of 20775956 is about 4558.0649403009. The cubic root of 20775956 is about 274.9077641086.

The spelling of 20775956 in words is "twenty million, seven hundred seventy-five thousand, nine hundred fifty-six".