20123124425 has 6 divisors (see below), whose sum is σ = 24952674318. Its totient is φ = 16098499520.

The previous prime is 20123124421. The next prime is 20123124431. The reversal of 20123124425 is 52442132102.

It can be written as a sum of positive squares in 3 ways, for example, as 2426941696 + 17696182729 = 49264^2 + 133027^2 .

It is not a de Polignac number, because 20123124425 - 2² = 20123124421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123124394 and 20123124403.

It is not an unprimeable number, because it can be changed into a prime (20123124421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402462464 + ... + 402462513.

It is an arithmetic number, because the mean of its divisors is an integer number (4158779053).

Almost surely, 2^20123124425 is an apocalyptic number.

20123124425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20123124425 is a deficient number, since it is larger than the sum of its proper divisors (4829549893).

20123124425 is an equidigital number, since it uses as much as digits as its factorization.

20123124425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804924987 (or 804924982 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 20123124425 its reverse (52442132102), we get a palindrome (72565256527).

The spelling of 20123124425 in words is "twenty billion, one hundred twenty-three million, one hundred twenty-four thousand, four hundred twenty-five".