20606645406 has 16 divisors (see below), whose sum is σ = 41216173200. Its totient is φ = 6868401408.

The previous prime is 20606645383. The next prime is 20606645413. The reversal of 20606645406 is 60454660602.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20851 + ... + 204078.

It is an arithmetic number, because the mean of its divisors is an integer number (2576010825).

Almost surely, 2^20606645406 is an apocalyptic number.

20606645406 is an abundant number, since it is smaller than the sum of its proper divisors (20609527794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20606645406 is a wasteful number, since it uses less digits than its factorization.

20606645406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240203.

The product of its (nonzero) digits is 207360, while the sum is 39.

It can be divided in two parts, 2060 and 6645406, that added together give a palindrome (6647466).

The spelling of 20606645406 in words is "twenty billion, six hundred six million, six hundred forty-five thousand, four hundred six".