20251749025 has 12 divisors (see below), whose sum is σ = 25117873132. Its totient is φ = 16197719040.

The previous prime is 20251748999. The next prime is 20251749029. The reversal of 20251749025 is 52094715202.

It can be written as a sum of positive squares in 6 ways, for example, as 5852709009 + 14399040016 = 76503^2 + 119996^2 .

It is not a de Polignac number, because 20251749025 - 2⁷ = 20251748897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20251749029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23077 + ... + 202573.

Almost surely, 2^20251749025 is an apocalyptic number.

20251749025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20251749025 is a deficient number, since it is larger than the sum of its proper divisors (4866124107).

20251749025 is a wasteful number, since it uses less digits than its factorization.

20251749025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184020 (or 184015 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 20251749025 in words is "twenty billion, two hundred fifty-one million, seven hundred forty-nine thousand, twenty-five".