20528255247 has 8 divisors (see below), whose sum is σ = 27636745344. Its totient is φ = 13552634328.

The previous prime is 20528255243. The next prime is 20528255269. The reversal of 20528255247 is 74255282502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20528255247 - 2² = 20528255243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20528255199 and 20528255208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528255243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33216933 + ... + 33217550.

It is an arithmetic number, because the mean of its divisors is an integer number (3454593168).

Almost surely, 2^20528255247 is an apocalyptic number.

20528255247 is a deficient number, since it is larger than the sum of its proper divisors (7108490097).

20528255247 is a wasteful number, since it uses less digits than its factorization.

20528255247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66434589.

The product of its (nonzero) digits is 448000, while the sum is 42.

The spelling of 20528255247 in words is "twenty billion, five hundred twenty-eight million, two hundred fifty-five thousand, two hundred forty-seven".