20815275625 has 45 divisors (see below), whose sum is σ = 27074670051. Its totient is φ = 15997212000.

The previous prime is 20815275601. The next prime is 20815275641. The reversal of 20815275625 is 52657251802.

The square root of 20815275625 is 144275.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 15568301529 + 5246974096 = 124773^2 + 72436^2 .

It is not a de Polignac number, because 20815275625 - 2⁷ = 20815275497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 104599276 + ... + 104599474.

Almost surely, 2^20815275625 is an apocalyptic number.

20815275625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20815275625 is the 144275-th square number.

20815275625 is the 72138-th centered octagonal number.

It is an amenable number.

20815275625 is a deficient number, since it is larger than the sum of its proper divisors (6259394426).

20815275625 is an frugal number, since it uses more digits than its factorization.

20815275625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 43.

The spelling of 20815275625 in words is "twenty billion, eight hundred fifteen million, two hundred seventy-five thousand, six hundred twenty-five".