20523052251 has 36 divisors (see below), whose sum is σ = 32345512056. Its totient is φ = 12533040000.

The previous prime is 20523052229. The next prime is 20523052259. The reversal of 20523052251 is 15225032502.

20523052251 is a `hidden beast` number, since 205 + 230 + 5 + 225 + 1 = 666.

It is not a de Polignac number, because 20523052251 - 2¹⁸ = 20522790107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20523052259) 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 35 ways as a sum of consecutive naturals, for example, 147751 + ... + 250751.

It is an arithmetic number, because the mean of its divisors is an integer number (898486446).

Almost surely, 2^20523052251 is an apocalyptic number.

20523052251 is a deficient number, since it is larger than the sum of its proper divisors (11822459805).

20523052251 is a wasteful number, since it uses less digits than its factorization.

20523052251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103164 (or 103148 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 20523052251 its reverse (15225032502), we get a palindrome (35748084753).

The spelling of 20523052251 in words is "twenty billion, five hundred twenty-three million, fifty-two thousand, two hundred fifty-one".