20111051 has 4 divisors (see below), whose sum is σ = 21294072. Its totient is φ = 18928032.

The previous prime is 20111027. The next prime is 20111053. The reversal of 20111051 is 15011102.

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 20111051 - 2¹⁴ = 20094667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111053) 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, 591485 + ... + 591518.

It is an arithmetic number, because the mean of its divisors is an integer number (5323518).

Almost surely, 2^20111051 is an apocalyptic number.

20111051 is a deficient number, since it is larger than the sum of its proper divisors (1183021).

20111051 is a wasteful number, since it uses less digits than its factorization.

20111051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183020.

The product of its (nonzero) digits is 10, while the sum is 11.

The square root of 20111051 is about 4484.5346469840. The cubic root of 20111051 is about 271.9432326386.

Adding to 20111051 its reverse (15011102), we get a palindrome (35122153).

The spelling of 20111051 in words is "twenty million, one hundred eleven thousand, fifty-one".