20500051 has 8 divisors (see below), whose sum is σ = 24084144. Its totient is φ = 17202720.

The previous prime is 20500049. The next prime is 20500063. The reversal of 20500051 is 15000502.

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 20500051 - 2¹ = 20500049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20500091) 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 7 ways as a sum of consecutive naturals, for example, 71536 + ... + 71821.

It is an arithmetic number, because the mean of its divisors is an integer number (3010518).

Almost surely, 2^20500051 is an apocalyptic number.

20500051 is a deficient number, since it is larger than the sum of its proper divisors (3584093).

20500051 is a wasteful number, since it uses less digits than its factorization.

20500051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143381.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 20500051 is about 4527.6982010730. The cubic root of 20500051 is about 273.6854106982.

Adding to 20500051 its reverse (15000502), we get a palindrome (35500553).

The spelling of 20500051 in words is "twenty million, five hundred thousand, fifty-one".