20517774725 has 48 divisors (see below), whose sum is σ = 31368135168. Its totient is φ = 12991779840.

The previous prime is 20517774679. The next prime is 20517774737. The reversal of 20517774725 is 52747771502.

It is not a de Polignac number, because 20517774725 - 2¹⁸ = 20517512581 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20517774725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92612 + ... + 222738.

It is an arithmetic number, because the mean of its divisors is an integer number (653502816).

Almost surely, 2^20517774725 is an apocalyptic number.

20517774725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20517774725 is a deficient number, since it is larger than the sum of its proper divisors (10850360443).

20517774725 is a wasteful number, since it uses less digits than its factorization.

20517774725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130214 (or 130209 counting only the distinct ones).

The product of its (nonzero) digits is 960400, while the sum is 47.

It can be divided in two parts, 2051777 and 4725, that added together give a palindrome (2056502).

The spelling of 20517774725 in words is "twenty billion, five hundred seventeen million, seven hundred seventy-four thousand, seven hundred twenty-five".