20942961 has 8 divisors (see below), whose sum is σ = 30072000. Its totient is φ = 12887952.

The previous prime is 20942951. The next prime is 20943007. The reversal of 20942961 is 16924902.

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

It is not a de Polignac number, because 20942961 - 2⁷ = 20942833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20942951) 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, 268461 + ... + 268538.

It is an arithmetic number, because the mean of its divisors is an integer number (3759000).

Almost surely, 2^20942961 is an apocalyptic number.

It is an amenable number.

20942961 is a deficient number, since it is larger than the sum of its proper divisors (9129039).

20942961 is a wasteful number, since it uses less digits than its factorization.

20942961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537015.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20942961 is about 4576.3479981313. The cubic root of 20942961 is about 275.6424034033.

The spelling of 20942961 in words is "twenty million, nine hundred forty-two thousand, nine hundred sixty-one".