20925402073 has 4 divisors (see below), whose sum is σ = 20925721060. Its totient is φ = 20925083088.

The previous prime is 20925401999. The next prime is 20925402077. The reversal of 20925402073 is 37020452902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37020452902 = 2 ⋅18510226451.

It can be written as a sum of positive squares in 2 ways, for example, as 17404997184 + 3520404889 = 131928^2 + 59333^2 .

It is a cyclic number.

It is not a de Polignac number, because 20925402073 - 2⁹ = 20925401561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20925402077) 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, 21018 + ... + 205651.

It is an arithmetic number, because the mean of its divisors is an integer number (5231430265).

Almost surely, 2^20925402073 is an apocalyptic number.

It is an amenable number.

20925402073 is a deficient number, since it is larger than the sum of its proper divisors (318987).

20925402073 is an equidigital number, since it uses as much as digits as its factorization.

20925402073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318986.

The product of its (nonzero) digits is 30240, while the sum is 34.

Adding to 20925402073 its reverse (37020452902), we get a palindrome (57945854975).

The spelling of 20925402073 in words is "twenty billion, nine hundred twenty-five million, four hundred two thousand, seventy-three".