20512542225 has 24 divisors (see below), whose sum is σ = 38758937920. Its totient is φ = 9377161920.

The previous prime is 20512542181. The next prime is 20512542233. The reversal of 20512542225 is 52224521502.

It is not a de Polignac number, because 20512542225 - 2¹¹ = 20512540177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20512542192 and 20512542201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19535230 + ... + 19536279.

Almost surely, 2^20512542225 is an apocalyptic number.

20512542225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20512542225 is a deficient number, since it is larger than the sum of its proper divisors (18246395695).

20512542225 is a wasteful number, since it uses less digits than its factorization.

20512542225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39071529 (or 39071524 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The spelling of 20512542225 in words is "twenty billion, five hundred twelve million, five hundred forty-two thousand, two hundred twenty-five".