20451334331 has 4 divisors (see below), whose sum is σ = 20886469152. Its totient is φ = 20016199512.

The previous prime is 20451334301. The next prime is 20451334357. The reversal of 20451334331 is 13343315402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20451334331 - 2¹⁴ = 20451317947 is a prime.

It is a super-2 number, since 2×20451334331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20451334294 and 20451334303.

It is not an unprimeable number, because it can be changed into a prime (20451334301) 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, 217567340 + ... + 217567433.

It is an arithmetic number, because the mean of its divisors is an integer number (5221617288).

Almost surely, 2^20451334331 is an apocalyptic number.

20451334331 is a deficient number, since it is larger than the sum of its proper divisors (435134821).

20451334331 is an equidigital number, since it uses as much as digits as its factorization.

20451334331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435134820.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 20451334331 its reverse (13343315402), we get a palindrome (33794649733).

The spelling of 20451334331 in words is "twenty billion, four hundred fifty-one million, three hundred thirty-four thousand, three hundred thirty-one".