20261020625 has 20 divisors (see below), whose sum is σ = 25423415028. Its totient is φ = 16141440000.

The previous prime is 20261020621. The next prime is 20261020669. The reversal of 20261020625 is 52602016202.

It can be written as a sum of positive squares in 10 ways, for example, as 11014082704 + 9246937921 = 104948^2 + 96161^2 .

It is not a de Polignac number, because 20261020625 - 2² = 20261020621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20261020594 and 20261020603.

It is not an unprimeable number, because it can be changed into a prime (20261020621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 83369 + ... + 217881.

Almost surely, 2^20261020625 is an apocalyptic number.

20261020625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20261020625 is a deficient number, since it is larger than the sum of its proper divisors (5162394403).

20261020625 is an equidigital number, since it uses as much as digits as its factorization.

20261020625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134774 (or 134759 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 20261020625 its reverse (52602016202), we get a palindrome (72863036827).

The spelling of 20261020625 in words is "twenty billion, two hundred sixty-one million, twenty thousand, six hundred twenty-five".