20645013125 has 20 divisors (see below), whose sum is σ = 28143291264. Its totient is φ = 15014550000.

The previous prime is 20645013119. The next prime is 20645013133. The reversal of 20645013125 is 52131054602.

It is not a de Polignac number, because 20645013125 - 2²⁴ = 20628235909 is a prime.

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 19 ways as a sum of consecutive naturals, for example, 1494581 + ... + 1508330.

Almost surely, 2^20645013125 is an apocalyptic number.

20645013125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20645013125 is a deficient number, since it is larger than the sum of its proper divisors (7498278139).

20645013125 is an equidigital number, since it uses as much as digits as its factorization.

20645013125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002942 (or 3002927 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 20645013125 its reverse (52131054602), we get a palindrome (72776067727).

The spelling of 20645013125 in words is "twenty billion, six hundred forty-five million, thirteen thousand, one hundred twenty-five".