20606387 has 4 divisors (see below), whose sum is σ = 20617656. Its totient is φ = 20595120.

The previous prime is 20606371. The next prime is 20606419. The reversal of 20606387 is 78360602.

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, and also an emirpimes, since its reverse is a distinct semiprime: 78360602 = 2 ⋅39180301.

It is a cyclic number.

It is not a de Polignac number, because 20606387 - 2⁴ = 20606371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2189 + ... + 6782.

It is an arithmetic number, because the mean of its divisors is an integer number (5154414).

Almost surely, 2^20606387 is an apocalyptic number.

20606387 is a deficient number, since it is larger than the sum of its proper divisors (11269).

20606387 is an equidigital number, since it uses as much as digits as its factorization.

20606387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11268.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20606387 is about 4539.4258447517. The cubic root of 20606387 is about 274.1578068704.

Adding to 20606387 its reverse (78360602), we get a palindrome (98966989).

The spelling of 20606387 in words is "twenty million, six hundred six thousand, three hundred eighty-seven".