20586977 has 4 divisors (see below), whose sum is σ = 20602260. Its totient is φ = 20571696.

The previous prime is 20586971. The next prime is 20586991. The reversal of 20586977 is 77968502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77968502 = 2 ⋅38984251.

It can be written as a sum of positive squares in 2 ways, for example, as 19149376 + 1437601 = 4376^2 + 1199^2 .

It is a cyclic number.

It is not a de Polignac number, because 20586977 - 2⁶ = 20586913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20586971) 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, 5402 + ... + 8387.

It is an arithmetic number, because the mean of its divisors is an integer number (5150565).

Almost surely, 2^20586977 is an apocalyptic number.

It is an amenable number.

20586977 is a deficient number, since it is larger than the sum of its proper divisors (15283).

20586977 is a wasteful number, since it uses less digits than its factorization.

20586977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15282.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 20586977 is about 4537.2874054880. The cubic root of 20586977 is about 274.0716996726.

The spelling of 20586977 in words is "twenty million, five hundred eighty-six thousand, nine hundred seventy-seven".