20948111 has 4 divisors (see below), whose sum is σ = 21036000. Its totient is φ = 20860224.

The previous prime is 20948077. The next prime is 20948113. The reversal of 20948111 is 11184902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20948111 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 (20948113) 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, 43586 + ... + 44063.

It is an arithmetic number, because the mean of its divisors is an integer number (5259000).

Almost surely, 2^20948111 is an apocalyptic number.

20948111 is a deficient number, since it is larger than the sum of its proper divisors (87889).

20948111 is an equidigital number, since it uses as much as digits as its factorization.

20948111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87888.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 20948111 is about 4576.9106392850. The cubic root of 20948111 is about 275.6649955929.

The spelling of 20948111 in words is "twenty million, nine hundred forty-eight thousand, one hundred eleven".