20777371 has 2 divisors, whose sum is σ = 20777372. Its totient is φ = 20777370.

The previous prime is 20777363. The next prime is 20777389. The reversal of 20777371 is 17377702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20777371 - 2³ = 20777363 is a prime.

It is not a weakly prime, because it can be changed into another prime (20777321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10388685 + 10388686.

It is an arithmetic number, because the mean of its divisors is an integer number (10388686).

Almost surely, 2^20777371 is an apocalyptic number.

20777371 is a deficient number, since it is larger than the sum of its proper divisors (1).

20777371 is an equidigital number, since it uses as much as digits as its factorization.

20777371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14406, while the sum is 34.

The square root of 20777371 is about 4558.2201570350. The cubic root of 20777371 is about 274.9140050673.

The spelling of 20777371 in words is "twenty million, seven hundred seventy-seven thousand, three hundred seventy-one".