20856805382 has 16 divisors (see below), whose sum is σ = 35782121760. Its totient is φ = 8931731328.

The previous prime is 20856805379. The next prime is 20856805427. The reversal of 20856805382 is 28350865802.

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, 556157 + ... + 592472.

It is an arithmetic number, because the mean of its divisors is an integer number (2236382610).

Almost surely, 2^20856805382 is an apocalyptic number.

20856805382 is a deficient number, since it is larger than the sum of its proper divisors (14925316378).

20856805382 is a wasteful number, since it uses less digits than its factorization.

20856805382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149935.

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 20856805382 in words is "twenty billion, eight hundred fifty-six million, eight hundred five thousand, three hundred eighty-two".