20000019973 has 2 divisors, whose sum is σ = 20000019974. Its totient is φ = 20000019972.

The previous prime is 20000019961. The next prime is 20000020009. The reversal of 20000019973 is 37991000002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17823051009 + 2176968964 = 133503^2 + 46658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20000019973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20000019373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000009986 + 10000009987.

It is an arithmetic number, because the mean of its divisors is an integer number (10000009987).

Almost surely, 2^20000019973 is an apocalyptic number.

It is an amenable number.

20000019973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000019973 is an equidigital number, since it uses as much as digits as its factorization.

20000019973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

Adding to 20000019973 its reverse (37991000002), we get a palindrome (57991019975).

The spelling of 20000019973 in words is "twenty billion, nineteen thousand, nine hundred seventy-three".