20502225125 has 8 divisors (see below), whose sum is σ = 25586777112. Its totient is φ = 16401780000.

The previous prime is 20502225077. The next prime is 20502225157. The reversal of 20502225125 is 52152220502.

It can be written as a sum of positive squares in 4 ways, for example, as 1566813889 + 18935411236 = 39583^2 + 137606^2 .

It is not a de Polignac number, because 20502225125 - 2²⁴ = 20485447909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20502225094 and 20502225103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82008776 + ... + 82009025.

It is an arithmetic number, because the mean of its divisors is an integer number (3198347139).

Almost surely, 2^20502225125 is an apocalyptic number.

20502225125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20502225125 is a deficient number, since it is larger than the sum of its proper divisors (5084551987).

20502225125 is an equidigital number, since it uses as much as digits as its factorization.

20502225125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164017816 (or 164017806 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 20502225125 its reverse (52152220502), we get a palindrome (72654445627).

The spelling of 20502225125 in words is "twenty billion, five hundred two million, two hundred twenty-five thousand, one hundred twenty-five".