20777087 has 2 divisors, whose sum is σ = 20777088. Its totient is φ = 20777086.

The previous prime is 20777069. The next prime is 20777101. The reversal of 20777087 is 78077702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20777087 - 2⁶ = 20777023 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20777087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20777287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10388543 + 10388544.

It is an arithmetic number, because the mean of its divisors is an integer number (10388544).

Almost surely, 2^20777087 is an apocalyptic number.

20777087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20777087 is an equidigital number, since it uses as much as digits as its factorization.

20777087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38416, while the sum is 38.

The square root of 20777087 is about 4558.1890044183. The cubic root of 20777087 is about 274.9127524877.

The spelling of 20777087 in words is "twenty million, seven hundred seventy-seven thousand, eighty-seven".