20924589251 has 4 divisors (see below), whose sum is σ = 21131763504. Its totient is φ = 20717415000.

The previous prime is 20924589229. The next prime is 20924589253. The reversal of 20924589251 is 15298542902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20924589251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20924589196 and 20924589205.

It is not an unprimeable number, because it can be changed into a prime (20924589253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103586975 + ... + 103587176.

It is an arithmetic number, because the mean of its divisors is an integer number (5282940876).

Almost surely, 2^20924589251 is an apocalyptic number.

20924589251 is a deficient number, since it is larger than the sum of its proper divisors (207174253).

20924589251 is a wasteful number, since it uses less digits than its factorization.

20924589251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207174252.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 20924589251 in words is "twenty billion, nine hundred twenty-four million, five hundred eighty-nine thousand, two hundred fifty-one".