20425333547 has 4 divisors (see below), whose sum is σ = 20923512456. Its totient is φ = 19927154640.

The previous prime is 20425333531. The next prime is 20425333549. The reversal of 20425333547 is 74533352402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74533352402 = 2 ⋅37266676201.

It is a cyclic number.

It is not a de Polignac number, because 20425333547 - 2⁴ = 20425333531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20425333547.

It is not an unprimeable number, because it can be changed into a prime (20425333549) 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, 249089393 + ... + 249089474.

It is an arithmetic number, because the mean of its divisors is an integer number (5230878114).

Almost surely, 2^20425333547 is an apocalyptic number.

20425333547 is a deficient number, since it is larger than the sum of its proper divisors (498178909).

20425333547 is an equidigital number, since it uses as much as digits as its factorization.

20425333547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498178908.

The product of its (nonzero) digits is 302400, while the sum is 38.

Adding to 20425333547 its reverse (74533352402), we get a palindrome (94958685949).

The spelling of 20425333547 in words is "twenty billion, four hundred twenty-five million, three hundred thirty-three thousand, five hundred forty-seven".