20659464815 has 8 divisors (see below), whose sum is σ = 27045117648. Its totient is φ = 15025065280.

The previous prime is 20659464799. The next prime is 20659464893. The reversal of 20659464815 is 51846495602.

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

It is not a de Polignac number, because 20659464815 - 2⁴ = 20659464799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187813262 + ... + 187813371.

It is an arithmetic number, because the mean of its divisors is an integer number (3380639706).

Almost surely, 2^20659464815 is an apocalyptic number.

20659464815 is a deficient number, since it is larger than the sum of its proper divisors (6385652833).

20659464815 is a wasteful number, since it uses less digits than its factorization.

20659464815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375626649.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 20659464815 in words is "twenty billion, six hundred fifty-nine million, four hundred sixty-four thousand, eight hundred fifteen".