19920691 has 8 divisors (see below), whose sum is σ = 23756544. Its totient is φ = 16332360.

The previous prime is 19920673. The next prime is 19920707. The reversal of 19920691 is 19602991.

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 19920691 - 2⁹ = 19920179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19920691.

It is not an unprimeable number, because it can be changed into a prime (19920611) 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, 61705 + ... + 62026.

It is an arithmetic number, because the mean of its divisors is an integer number (2969568).

Almost surely, 2^19920691 is an apocalyptic number.

19920691 is a deficient number, since it is larger than the sum of its proper divisors (3835853).

19920691 is a wasteful number, since it uses less digits than its factorization.

19920691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123761.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 19920691 is about 4463.2601313390. The cubic root of 19920691 is about 271.0824901045.

The spelling of 19920691 in words is "nineteen million, nine hundred twenty thousand, six hundred ninety-one".