20692961 has 4 divisors (see below), whose sum is σ = 21910212. Its totient is φ = 19475712.

The previous prime is 20692901. The next prime is 20692967. The reversal of 20692961 is 16929602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17380561 + 3312400 = 4169^2 + 1820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20692961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20692967) 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, 608600 + ... + 608633.

It is an arithmetic number, because the mean of its divisors is an integer number (5477553).

Almost surely, 2^20692961 is an apocalyptic number.

It is an amenable number.

20692961 is a deficient number, since it is larger than the sum of its proper divisors (1217251).

20692961 is a wasteful number, since it uses less digits than its factorization.

20692961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217250.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20692961 is about 4548.9516374655. The cubic root of 20692961 is about 274.5412118796.

The spelling of 20692961 in words is "twenty million, six hundred ninety-two thousand, nine hundred sixty-one".