20340961 has 8 divisors (see below), whose sum is σ = 20959848. Its totient is φ = 19728000.

The previous prime is 20340937. The next prime is 20341007. The reversal of 20340961 is 16904302.

It can be written as a sum of positive squares in 4 ways, for example, as 2193361 + 18147600 = 1481^2 + 4260^2 .

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 20340961 - 2⁷ = 20340833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20340911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6051 + ... + 8791.

It is an arithmetic number, because the mean of its divisors is an integer number (2619981).

Almost surely, 2^20340961 is an apocalyptic number.

It is an amenable number.

20340961 is a deficient number, since it is larger than the sum of its proper divisors (618887).

20340961 is a wasteful number, since it uses less digits than its factorization.

20340961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20340961 is about 4510.0954535353. The cubic root of 20340961 is about 272.9755956842.

The spelling of 20340961 in words is "twenty million, three hundred forty thousand, nine hundred sixty-one".