20606393 has 4 divisors (see below), whose sum is σ = 21690960. Its totient is φ = 19521828.

The previous prime is 20606371. The next prime is 20606419. The reversal of 20606393 is 39360602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20606393 - 2¹² = 20602297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606293) 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, 542255 + ... + 542292.

It is an arithmetic number, because the mean of its divisors is an integer number (5422740).

Almost surely, 2^20606393 is an apocalyptic number.

It is an amenable number.

20606393 is a deficient number, since it is larger than the sum of its proper divisors (1084567).

20606393 is a wasteful number, since it uses less digits than its factorization.

20606393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084566.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 20606393 is about 4539.4265056282. The cubic root of 20606393 is about 274.1578334794.

Adding to 20606393 its reverse (39360602), we get a palindrome (59966995).

The spelling of 20606393 in words is "twenty million, six hundred six thousand, three hundred ninety-three".