20305051 has 8 divisors (see below), whose sum is σ = 21907760. Its totient is φ = 18708192.

The previous prime is 20305049. The next prime is 20305063. The reversal of 20305051 is 15050302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20305051 - 2¹ = 20305049 is a prime.

It is a super-2 number, since 2×20305051² = 824590192225202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20305151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8116 + ... + 10318.

It is an arithmetic number, because the mean of its divisors is an integer number (2738470).

Almost surely, 2^20305051 is an apocalyptic number.

20305051 is a deficient number, since it is larger than the sum of its proper divisors (1602709).

20305051 is a wasteful number, since it uses less digits than its factorization.

20305051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20305051 is about 4506.1126262001. The cubic root of 20305051 is about 272.8148637209.

Adding to 20305051 its reverse (15050302), we get a palindrome (35355353).

The spelling of 20305051 in words is "twenty million, three hundred five thousand, fifty-one".