20012771 has 2 divisors, whose sum is σ = 20012772. Its totient is φ = 20012770.

The previous prime is 20012767. The next prime is 20012801. The reversal of 20012771 is 17721002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20012771 - 2² = 20012767 is a prime.

It is a super-2 number, since 2×20012771² = 801022006196882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20012761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006385 + 10006386.

It is an arithmetic number, because the mean of its divisors is an integer number (10006386).

Almost surely, 2^20012771 is an apocalyptic number.

20012771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012771 is an equidigital number, since it uses as much as digits as its factorization.

20012771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 20012771 is about 4473.5635683424. The cubic root of 20012771 is about 271.4995257451.

Adding to 20012771 its reverse (17721002), we get a palindrome (37733773).

The spelling of 20012771 in words is "twenty million, twelve thousand, seven hundred seventy-one".