20886977 has 2 divisors, whose sum is σ = 20886978. Its totient is φ = 20886976.

The previous prime is 20886961. The next prime is 20886991. The reversal of 20886977 is 77968802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 9388096 = 3391^2 + 3064^2 .

It is a cyclic number.

It is not a de Polignac number, because 20886977 - 2⁴ = 20886961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20882977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10443488 + 10443489.

It is an arithmetic number, because the mean of its divisors is an integer number (10443489).

Almost surely, 2^20886977 is an apocalyptic number.

It is an amenable number.

20886977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20886977 is an equidigital number, since it uses as much as digits as its factorization.

20886977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 20886977 is about 4570.2272372389. The cubic root of 20886977 is about 275.3965716392.

The spelling of 20886977 in words is "twenty million, eight hundred eighty-six thousand, nine hundred seventy-seven".