20425445428 has 12 divisors (see below), whose sum is σ = 35747387172. Its totient is φ = 10211906240.

The previous prime is 20425445423. The next prime is 20425445431. The reversal of 20425445428 is 82454452402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11412221584 + 9013223844 = 106828^2 + 94938^2 .

It is a super-2 number, since 2×20425445428² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425445423) 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, 145993 + ... + 249328.

It is an arithmetic number, because the mean of its divisors is an integer number (2978948931).

Almost surely, 2^20425445428 is an apocalyptic number.

It is an amenable number.

20425445428 is a deficient number, since it is larger than the sum of its proper divisors (15321941744).

20425445428 is a wasteful number, since it uses less digits than its factorization.

20425445428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408242 (or 408240 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 40.

The spelling of 20425445428 in words is "twenty billion, four hundred twenty-five million, four hundred forty-five thousand, four hundred twenty-eight".