20451689429 has 2 divisors, whose sum is σ = 20451689430. Its totient is φ = 20451689428.

The previous prime is 20451689383. The next prime is 20451689441. The reversal of 20451689429 is 92498615402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20221408804 + 230280625 = 142202^2 + 15175^2 .

It is a cyclic number.

It is not a de Polignac number, because 20451689429 - 2¹² = 20451685333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451689029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225844714 + 10225844715.

It is an arithmetic number, because the mean of its divisors is an integer number (10225844715).

Almost surely, 2^20451689429 is an apocalyptic number.

It is an amenable number.

20451689429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451689429 is an equidigital number, since it uses as much as digits as its factorization.

20451689429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 20451689429 in words is "twenty billion, four hundred fifty-one million, six hundred eighty-nine thousand, four hundred twenty-nine".