20856664234036 has 12 divisors (see below), whose sum is σ = 36503424896512. Its totient is φ = 10427114263608.

The previous prime is 20856664233991. The next prime is 20856664234061. The reversal of 20856664234036 is 63043246665802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304424820 + ... + 304493323.

Almost surely, 2^{20856664234036} is an apocalyptic number.

It is an amenable number.

20856664234036 is a deficient number, since it is larger than the sum of its proper divisors (15646760662476).

20856664234036 is a wasteful number, since it uses less digits than its factorization.

20856664234036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608926710 (or 608926708 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 55.

The spelling of 20856664234036 in words is "twenty trillion, eight hundred fifty-six billion, six hundred sixty-four million, two hundred thirty-four thousand, thirty-six".