20517422471501 has 16 divisors (see below), whose sum is σ = 21441099423744. Its totient is φ = 19596385598064.

The previous prime is 20517422471453. The next prime is 20517422471543. The reversal of 20517422471501 is 10517422471502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20517422471501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20517422471591) 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, 181316126 + ... + 181429248.

It is an arithmetic number, because the mean of its divisors is an integer number (1340068713984).

Almost surely, 2^{20517422471501} is an apocalyptic number.

It is an amenable number.

20517422471501 is a deficient number, since it is larger than the sum of its proper divisors (923676952243).

20517422471501 is a wasteful number, since it uses less digits than its factorization.

20517422471501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124720.

The product of its (nonzero) digits is 156800, while the sum is 41.

Subtracting from 20517422471501 its reverse (10517422471502), we obtain a palindrome (9999999999999).

The spelling of 20517422471501 in words is "twenty trillion, five hundred seventeen billion, four hundred twenty-two million, four hundred seventy-one thousand, five hundred one".