20206051 has 4 divisors (see below), whose sum is σ = 20220192. Its totient is φ = 20191912.

The previous prime is 20206049. The next prime is 20206097. The reversal of 20206051 is 15060202.

It is a happy number.

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 20206051 - 2¹ = 20206049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20206651) 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, 4651 + ... + 7876.

It is an arithmetic number, because the mean of its divisors is an integer number (5055048).

Almost surely, 2^20206051 is an apocalyptic number.

20206051 is a deficient number, since it is larger than the sum of its proper divisors (14141).

20206051 is a wasteful number, since it uses less digits than its factorization.

20206051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14140.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20206051 is about 4495.1141253588. The cubic root of 20206051 is about 272.3707593517.

Adding to 20206051 its reverse (15060202), we get a palindrome (35266253).

The spelling of 20206051 in words is "twenty million, two hundred six thousand, fifty-one".