20011371 has 4 divisors (see below), whose sum is σ = 26681832. Its totient is φ = 13340912.

The previous prime is 20011361. The next prime is 20011373. The reversal of 20011371 is 17311002.

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-20011371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011371.

It is not an unprimeable number, because it can be changed into a prime (20011373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335226 + ... + 3335231.

It is an arithmetic number, because the mean of its divisors is an integer number (6670458).

Almost surely, 2^20011371 is an apocalyptic number.

20011371 is a deficient number, since it is larger than the sum of its proper divisors (6670461).

20011371 is an equidigital number, since it uses as much as digits as its factorization.

20011371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670460.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 20011371 is about 4473.4070907978. The cubic root of 20011371 is about 271.4931946512.

Adding to 20011371 its reverse (17311002), we get a palindrome (37322373).

The spelling of 20011371 in words is "twenty million, eleven thousand, three hundred seventy-one".