20506077 has 6 divisors (see below), whose sum is σ = 29619902. Its totient is φ = 13670712.

The previous prime is 20506067. The next prime is 20506081. The reversal of 20506077 is 77060502.

20506077 is a `hidden beast` number, since 2 + 0 + 50 + 607 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15280281 + 5225796 = 3909^2 + 2286^2 .

It is not a de Polignac number, because 20506077 - 2¹² = 20501981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20506077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506037) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1139218 + ... + 1139235.

Almost surely, 2^20506077 is an apocalyptic number.

It is an amenable number.

20506077 is a deficient number, since it is larger than the sum of its proper divisors (9113825).

20506077 is a wasteful number, since it uses less digits than its factorization.

20506077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278459 (or 2278456 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 20506077 is about 4528.3636117255. The cubic root of 20506077 is about 273.7122247244.

Adding to 20506077 its reverse (77060502), we get a palindrome (97566579).

The spelling of 20506077 in words is "twenty million, five hundred six thousand, seventy-seven".