20503033081 has 2 divisors, whose sum is σ = 20503033082. Its totient is φ = 20503033080.

The previous prime is 20503033043. The next prime is 20503033087. The reversal of 20503033081 is 18033030502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16722627856 + 3780405225 = 129316^2 + 61485^2 .

It is a cyclic number.

It is not a de Polignac number, because 20503033081 - 2²³ = 20494644473 is a prime.

It is a super-2 number, since 2×20503033081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20503033087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251516540 + 10251516541.

It is an arithmetic number, because the mean of its divisors is an integer number (10251516541).

Almost surely, 2^20503033081 is an apocalyptic number.

It is an amenable number.

20503033081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503033081 is an equidigital number, since it uses as much as digits as its factorization.

20503033081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 20503033081 its reverse (18033030502), we get a palindrome (38536063583).

The spelling of 20503033081 in words is "twenty billion, five hundred three million, thirty-three thousand, eighty-one".