20578353251 has 4 divisors (see below), whose sum is σ = 20578649952. Its totient is φ = 20578056552.

The previous prime is 20578353227. The next prime is 20578353259. The reversal of 20578353251 is 15235387502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15235387502 = 2 ⋅7617693751.

It is a cyclic number.

It is not a de Polignac number, because 20578353251 - 2¹⁰ = 20578352227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20578353199 and 20578353208.

It is not an unprimeable number, because it can be changed into a prime (20578353259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17465 + ... + 203621.

It is an arithmetic number, because the mean of its divisors is an integer number (5144662488).

Almost surely, 2^20578353251 is an apocalyptic number.

20578353251 is a deficient number, since it is larger than the sum of its proper divisors (296701).

20578353251 is a wasteful number, since it uses less digits than its factorization.

20578353251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296700.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 20578353251 in words is "twenty billion, five hundred seventy-eight million, three hundred fifty-three thousand, two hundred fifty-one".