20533232425 has 6 divisors (see below), whose sum is σ = 25461208238. Its totient is φ = 16426585920.

The previous prime is 20533232371. The next prime is 20533232429. The reversal of 20533232425 is 52423233502.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1057355289 + 19475877136 = 32517^2 + 139556^2 .

It is not a de Polignac number, because 20533232425 - 2²³ = 20524843817 is a prime.

It is a super-2 number, since 2×20533232425² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20533232429) 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, 410664624 + ... + 410664673.

Almost surely, 2^20533232425 is an apocalyptic number.

20533232425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20533232425 is a deficient number, since it is larger than the sum of its proper divisors (4927975813).

20533232425 is an equidigital number, since it uses as much as digits as its factorization.

20533232425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821329307 (or 821329302 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 31.

Adding to 20533232425 its reverse (52423233502), we get a palindrome (72956465927).

The spelling of 20533232425 in words is "twenty billion, five hundred thirty-three million, two hundred thirty-two thousand, four hundred twenty-five".