20051081 has 2 divisors, whose sum is σ = 20051082. Its totient is φ = 20051080.

The previous prime is 20051071. The next prime is 20051107. The reversal of 20051081 is 18015002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 1638400 = 4291^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 20051081 - 2¹⁰ = 20050057 is a prime.

It is a super-2 number, since 2×20051081² = 804091698537122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20051071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025540 + 10025541.

It is an arithmetic number, because the mean of its divisors is an integer number (10025541).

Almost surely, 2^20051081 is an apocalyptic number.

It is an amenable number.

20051081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20051081 is an equidigital number, since it uses as much as digits as its factorization.

20051081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 20051081 is about 4477.8433425032. The cubic root of 20051081 is about 271.6726571418.

Adding to 20051081 its reverse (18015002), we get a palindrome (38066083).

The spelling of 20051081 in words is "twenty million, fifty-one thousand, eighty-one".