20387077 has 4 divisors (see below), whose sum is σ = 20396140. Its totient is φ = 20378016.

The previous prime is 20387071. The next prime is 20387083. The reversal of 20387077 is 77078302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (20387071) and next prime (20387083).

It can be written as a sum of positive squares in 2 ways, for example, as 10439361 + 9947716 = 3231^2 + 3154^2 .

It is a cyclic number.

It is not a de Polignac number, because 20387077 - 2³ = 20387069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (5099035).

Almost surely, 2^20387077 is an apocalyptic number.

It is an amenable number.

20387077 is a deficient number, since it is larger than the sum of its proper divisors (9063).

20387077 is an equidigital number, since it uses as much as digits as its factorization.

20387077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9062.

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

The square root of 20387077 is about 4515.2050894727. The cubic root of 20387077 is about 273.1817321456.

The spelling of 20387077 in words is "twenty million, three hundred eighty-seven thousand, seventy-seven".