20380777 has 2 divisors, whose sum is σ = 20380778. Its totient is φ = 20380776.

The previous prime is 20380769. The next prime is 20380799. The reversal of 20380777 is 77708302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18870336 + 1510441 = 4344^2 + 1229^2 .

It is a cyclic number.

It is not a de Polignac number, because 20380777 - 2³ = 20380769 is a prime.

It is a super-2 number, since 2×20380777² = 830752142247458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20380177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190388 + 10190389.

It is an arithmetic number, because the mean of its divisors is an integer number (10190389).

Almost surely, 2^20380777 is an apocalyptic number.

It is an amenable number.

20380777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20380777 is an equidigital number, since it uses as much as digits as its factorization.

20380777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 20380777 is about 4514.5073928392. The cubic root of 20380777 is about 273.1535897718.

The spelling of 20380777 in words is "twenty million, three hundred eighty thousand, seven hundred seventy-seven".