20540500651 has 4 divisors (see below), whose sum is σ = 22407818904. Its totient is φ = 18673182400.

The previous prime is 20540500619. The next prime is 20540500667. The reversal of 20540500651 is 15600504502.

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 20540500651 - 2⁵ = 20540500619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20540500691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933659110 + ... + 933659131.

It is an arithmetic number, because the mean of its divisors is an integer number (5601954726).

Almost surely, 2^20540500651 is an apocalyptic number.

20540500651 is a deficient number, since it is larger than the sum of its proper divisors (1867318253).

20540500651 is a wasteful number, since it uses less digits than its factorization.

20540500651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867318252.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 20540500651 in words is "twenty billion, five hundred forty million, five hundred thousand, six hundred fifty-one".