20506607517 has 16 divisors (see below), whose sum is σ = 29847605760. Its totient is φ = 12419991600.

The previous prime is 20506607509. The next prime is 20506607543. The reversal of 20506607517 is 71570660502.

It is not a de Polignac number, because 20506607517 - 2³ = 20506607509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506607917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155767 + ... + 255492.

It is an arithmetic number, because the mean of its divisors is an integer number (1865475360).

Almost surely, 2^20506607517 is an apocalyptic number.

It is an amenable number.

20506607517 is a deficient number, since it is larger than the sum of its proper divisors (9340998243).

20506607517 is a wasteful number, since it uses less digits than its factorization.

20506607517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412784.

The product of its (nonzero) digits is 88200, while the sum is 39.

The spelling of 20506607517 in words is "twenty billion, five hundred six million, six hundred seven thousand, five hundred seventeen".