20692391 has 8 divisors (see below), whose sum is σ = 21166080. Its totient is φ = 20224152.

The previous prime is 20692379. The next prime is 20692423. The reversal of 20692391 is 19329602.

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 20692391 - 2⁶ = 20692327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20695391) 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 7 ways as a sum of consecutive naturals, for example, 6866 + ... + 9408.

It is an arithmetic number, because the mean of its divisors is an integer number (2645760).

Almost surely, 2^20692391 is an apocalyptic number.

20692391 is a deficient number, since it is larger than the sum of its proper divisors (473689).

20692391 is a wasteful number, since it uses less digits than its factorization.

20692391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2725.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 20692391 is about 4548.8889852358. Note that the first 3 decimals coincide. The cubic root of 20692391 is about 274.5386910557.

The spelling of 20692391 in words is "twenty million, six hundred ninety-two thousand, three hundred ninety-one".