20073002581 has 2 divisors, whose sum is σ = 20073002582. Its totient is φ = 20073002580.

The previous prime is 20073002549. The next prime is 20073002617. The reversal of 20073002581 is 18520037002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14479308900 + 5593693681 = 120330^2 + 74791^2 .

It is a cyclic number.

It is not a de Polignac number, because 20073002581 - 2⁵ = 20073002549 is a prime.

It is a super-2 number, since 2×20073002581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20073002981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10036501290 + 10036501291.

It is an arithmetic number, because the mean of its divisors is an integer number (10036501291).

Almost surely, 2^20073002581 is an apocalyptic number.

It is an amenable number.

20073002581 is a deficient number, since it is larger than the sum of its proper divisors (1).

20073002581 is an equidigital number, since it uses as much as digits as its factorization.

20073002581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 20073002581 its reverse (18520037002), we get a palindrome (38593039583).

The spelling of 20073002581 in words is "twenty billion, seventy-three million, two thousand, five hundred eighty-one".