20761771 has 2 divisors, whose sum is σ = 20761772. Its totient is φ = 20761770.

The previous prime is 20761757. The next prime is 20761781. The reversal of 20761771 is 17716702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20761771 - 2⁵ = 20761739 is a prime.

It is a super-2 number, since 2×20761771² = 862102270112882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20761721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10380885 + 10380886.

It is an arithmetic number, because the mean of its divisors is an integer number (10380886).

Almost surely, 2^20761771 is an apocalyptic number.

20761771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20761771 is an equidigital number, since it uses as much as digits as its factorization.

20761771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 31.

The square root of 20761771 is about 4556.5086414930. The cubic root of 20761771 is about 274.8451844859.

The spelling of 20761771 in words is "twenty million, seven hundred sixty-one thousand, seven hundred seventy-one".