20471564517 has 8 divisors (see below), whose sum is σ = 27343224480. Its totient is φ = 13623807120.

The previous prime is 20471564507. The next prime is 20471564557. The reversal of 20471564517 is 71546517402.

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

It is not a de Polignac number, because 20471564517 - 2⁷ = 20471564389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471564507) 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, 5973642 + ... + 5977067.

It is an arithmetic number, because the mean of its divisors is an integer number (3417903060).

Almost surely, 2^20471564517 is an apocalyptic number.

It is an amenable number.

20471564517 is a deficient number, since it is larger than the sum of its proper divisors (6871659963).

20471564517 is a wasteful number, since it uses less digits than its factorization.

20471564517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11951283.

The product of its (nonzero) digits is 235200, while the sum is 42.

The spelling of 20471564517 in words is "twenty billion, four hundred seventy-one million, five hundred sixty-four thousand, five hundred seventeen".