20473425251 has 4 divisors (see below), whose sum is σ = 20491030392. Its totient is φ = 20455820112.

The previous prime is 20473425241. The next prime is 20473425253. The reversal of 20473425251 is 15252437402.

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-20473425251 is a prime.

It is a super-2 number, since 2×20473425251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20473425253) 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, 8800826 + ... + 8803151.

It is an arithmetic number, because the mean of its divisors is an integer number (5122757598).

Almost surely, 2^20473425251 is an apocalyptic number.

20473425251 is a deficient number, since it is larger than the sum of its proper divisors (17605141).

20473425251 is a wasteful number, since it uses less digits than its factorization.

20473425251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17605140.

The product of its (nonzero) digits is 67200, while the sum is 35.

The spelling of 20473425251 in words is "twenty billion, four hundred seventy-three million, four hundred twenty-five thousand, two hundred fifty-one".