20717001125 has 24 divisors (see below), whose sum is σ = 27465199944. Its totient is φ = 15598656000.

The previous prime is 20717001083. The next prime is 20717001161. The reversal of 20717001125 is 52110071702.

It can be written as a sum of positive squares in 12 ways, for example, as 9701659009 + 11015342116 = 98497^2 + 104954^2 .

It is not a de Polignac number, because 20717001125 - 2⁶ = 20717001061 is a prime.

It is a super-2 number, since 2×20717001125² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20717001094 and 20717001103.

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 23 ways as a sum of consecutive naturals, for example, 250616 + ... + 322865.

It is an arithmetic number, because the mean of its divisors is an integer number (1144383331).

Almost surely, 2^20717001125 is an apocalyptic number.

20717001125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20717001125 is a deficient number, since it is larger than the sum of its proper divisors (6748198819).

20717001125 is an equidigital number, since it uses as much as digits as its factorization.

20717001125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573530 (or 573503 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 26.

Adding to 20717001125 its reverse (52110071702), we get a palindrome (72827072827).

The spelling of 20717001125 in words is "twenty billion, seven hundred seventeen million, one thousand, one hundred twenty-five".