20450077 has 4 divisors (see below), whose sum is σ = 20473020. Its totient is φ = 20427136.

The previous prime is 20450071. The next prime is 20450083. The reversal of 20450077 is 77005402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77005402 = 2 ⋅38502701.

It is an interprime number because it is at equal distance from previous prime (20450071) and next prime (20450083).

It can be written as a sum of positive squares in 2 ways, for example, as 5788836 + 14661241 = 2406^2 + 3829^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20450077 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 (20450071) 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, 10078 + ... + 11935.

It is an arithmetic number, because the mean of its divisors is an integer number (5118255).

Almost surely, 2^20450077 is an apocalyptic number.

It is an amenable number.

20450077 is a deficient number, since it is larger than the sum of its proper divisors (22943).

20450077 is an equidigital number, since it uses as much as digits as its factorization.

20450077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22942.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20450077 is about 4522.1761354463. The cubic root of 20450077 is about 273.4628375345.

Adding to 20450077 its reverse (77005402), we get a palindrome (97455479).

The spelling of 20450077 in words is "twenty million, four hundred fifty thousand, seventy-seven".