20535234425 has 6 divisors (see below), whose sum is σ = 25463690718. Its totient is φ = 16428187520.

The previous prime is 20535234389. The next prime is 20535234431. The reversal of 20535234425 is 52443253502.

It can be written as a sum of positive squares in 3 ways, for example, as 3843628009 + 16691606416 = 61997^2 + 129196^2 .

It is not a de Polignac number, because 20535234425 - 2⁸ = 20535234169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 410704664 + ... + 410704713.

It is an arithmetic number, because the mean of its divisors is an integer number (4243948453).

Almost surely, 2^20535234425 is an apocalyptic number.

20535234425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20535234425 is a deficient number, since it is larger than the sum of its proper divisors (4928456293).

20535234425 is an equidigital number, since it uses as much as digits as its factorization.

20535234425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821409387 (or 821409382 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 35.

Adding to 20535234425 its reverse (52443253502), we get a palindrome (72978487927).

The spelling of 20535234425 in words is "twenty billion, five hundred thirty-five million, two hundred thirty-four thousand, four hundred twenty-five".