20996111 has 4 divisors (see below), whose sum is σ = 21058752. Its totient is φ = 20933472.

The previous prime is 20996099. The next prime is 20996117. The reversal of 20996111 is 11169902.

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

It is a cyclic number.

It is not a de Polignac number, because 20996111 - 2⁶ = 20996047 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 (20996117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30815 + ... + 31488.

It is an arithmetic number, because the mean of its divisors is an integer number (5264688).

Almost surely, 2^20996111 is an apocalyptic number.

20996111 is a deficient number, since it is larger than the sum of its proper divisors (62641).

20996111 is an equidigital number, since it uses as much as digits as its factorization.

20996111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62640.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 20996111 is about 4582.1513506212. The cubic root of 20996111 is about 275.8753857040.

The spelling of 20996111 in words is "twenty million, nine hundred ninety-six thousand, one hundred eleven".