20928172593 has 16 divisors (see below), whose sum is σ = 28440227520. Its totient is φ = 13684292544.

The previous prime is 20928172591. The next prime is 20928172597. The reversal of 20928172593 is 39527182902.

It is not a de Polignac number, because 20928172593 - 2¹ = 20928172591 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20928172591) 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, 493030 + ... + 533792.

It is an arithmetic number, because the mean of its divisors is an integer number (1777514220).

Almost surely, 2^20928172593 is an apocalyptic number.

It is an amenable number.

20928172593 is a deficient number, since it is larger than the sum of its proper divisors (7512054927).

20928172593 is a wasteful number, since it uses less digits than its factorization.

20928172593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44048.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 20928172593 in words is "twenty billion, nine hundred twenty-eight million, one hundred seventy-two thousand, five hundred ninety-three".