20096991 has 20 divisors (see below), whose sum is σ = 30181272. Its totient is φ = 13326768.

The previous prime is 20096987. The next prime is 20097013. The reversal of 20096991 is 19969002.

It is not a de Polignac number, because 20096991 - 2² = 20096987 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20096591) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17841 + ... + 18933.

Almost surely, 2^20096991 is an apocalyptic number.

20096991 is a deficient number, since it is larger than the sum of its proper divisors (10084281).

20096991 is a wasteful number, since it uses less digits than its factorization.

20096991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 20096991 is about 4482.9667632049. The cubic root of 20096991 is about 271.8798443845.

The spelling of 20096991 in words is "twenty million, ninety-six thousand, nine hundred ninety-one".