20208051 has 6 divisors (see below), whose sum is σ = 29189420. Its totient is φ = 13472028.

The previous prime is 20208049. The next prime is 20208059. The reversal of 20208051 is 15080202.

It is not a de Polignac number, because 20208051 - 2¹ = 20208049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20208059) 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 5 ways as a sum of consecutive naturals, for example, 1122661 + ... + 1122678.

Almost surely, 2^20208051 is an apocalyptic number.

20208051 is a deficient number, since it is larger than the sum of its proper divisors (8981369).

20208051 is a wasteful number, since it uses less digits than its factorization.

20208051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245345 (or 2245342 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20208051 is about 4495.3365836164. The cubic root of 20208051 is about 272.3797454973.

Adding to 20208051 its reverse (15080202), we get a palindrome (35288253).

The spelling of 20208051 in words is "twenty million, two hundred eight thousand, fifty-one".