20952761 has 4 divisors (see below), whose sum is σ = 21675300. Its totient is φ = 20230224.

The previous prime is 20952751. The next prime is 20952773. The reversal of 20952761 is 16725902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16725902 = 2 ⋅8362951.

It can be written as a sum of positive squares in 2 ways, for example, as 18011536 + 2941225 = 4244^2 + 1715^2 .

It is a cyclic number.

It is not a de Polignac number, because 20952761 - 2⁶ = 20952697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20952731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361226 + ... + 361283.

It is an arithmetic number, because the mean of its divisors is an integer number (5418825).

Almost surely, 2^20952761 is an apocalyptic number.

It is an amenable number.

20952761 is a deficient number, since it is larger than the sum of its proper divisors (722539).

20952761 is an equidigital number, since it uses as much as digits as its factorization.

20952761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722538.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20952761 is about 4577.4185956716. The cubic root of 20952761 is about 275.6853911852.

The spelling of 20952761 in words is "twenty million, nine hundred fifty-two thousand, seven hundred sixty-one".