20011023973 has 2 divisors, whose sum is σ = 20011023974. Its totient is φ = 20011023972.

The previous prime is 20011023971. The next prime is 20011024027. The reversal of 20011023973 is 37932011002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10686804129 + 9324219844 = 103377^2 + 96562^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011023973 - 2¹ = 20011023971 is a prime.

Together with 20011023971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011023971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005511986 + 10005511987.

It is an arithmetic number, because the mean of its divisors is an integer number (10005511987).

Almost surely, 2^20011023973 is an apocalyptic number.

It is an amenable number.

20011023973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011023973 is an equidigital number, since it uses as much as digits as its factorization.

20011023973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

Adding to 20011023973 its reverse (37932011002), we get a palindrome (57943034975).

The spelling of 20011023973 in words is "twenty billion, eleven million, twenty-three thousand, nine hundred seventy-three".