20500043051 has 4 divisors (see below), whose sum is σ = 20501409312. Its totient is φ = 20498676792.

The previous prime is 20500043033. The next prime is 20500043059. The reversal of 20500043051 is 15034000502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15034000502 = 2 ⋅7517000251.

It is a cyclic number.

It is not a de Polignac number, because 20500043051 - 2⁶ = 20500042987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20500043059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660371 + ... + 690716.

It is an arithmetic number, because the mean of its divisors is an integer number (5125352328).

Almost surely, 2^20500043051 is an apocalyptic number.

20500043051 is a deficient number, since it is larger than the sum of its proper divisors (1366261).

20500043051 is a wasteful number, since it uses less digits than its factorization.

20500043051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366260.

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 20500043051 its reverse (15034000502), we get a palindrome (35534043553).

The spelling of 20500043051 in words is "twenty billion, five hundred million, forty-three thousand, fifty-one".