20102205825 has 72 divisors (see below), whose sum is σ = 38818291512. Its totient is φ = 9885404160.

The previous prime is 20102205821. The next prime is 20102205847. The reversal of 20102205825 is 52850220102.

It can be written as a sum of positive squares in 12 ways, for example, as 9245399409 + 10856806416 = 96153^2 + 104196^2 .

It is not a de Polignac number, because 20102205825 - 2² = 20102205821 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20102205821) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3018199 + ... + 3024851.

Almost surely, 2^20102205825 is an apocalyptic number.

20102205825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20102205825 is a deficient number, since it is larger than the sum of its proper divisors (18716085687).

20102205825 is a wasteful number, since it uses less digits than its factorization.

20102205825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715 (or 7707 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 20102205825 its reverse (52850220102), we get a palindrome (72952425927).

The spelling of 20102205825 in words is "twenty billion, one hundred two million, two hundred five thousand, eight hundred twenty-five".