20453431637 has 2 divisors, whose sum is σ = 20453431638. Its totient is φ = 20453431636.

The previous prime is 20453431601. The next prime is 20453431681. The reversal of 20453431637 is 73613435402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14420647396 + 6032784241 = 120086^2 + 77671^2 .

It is a cyclic number.

It is not a de Polignac number, because 20453431637 - 2¹² = 20453427541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20453431637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20453131637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10226715818 + 10226715819.

It is an arithmetic number, because the mean of its divisors is an integer number (10226715819).

Almost surely, 2^20453431637 is an apocalyptic number.

It is an amenable number.

20453431637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20453431637 is an equidigital number, since it uses as much as digits as its factorization.

20453431637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 38.

The spelling of 20453431637 in words is "twenty billion, four hundred fifty-three million, four hundred thirty-one thousand, six hundred thirty-seven".