20856805378 has 16 divisors (see below), whose sum is σ = 31593692160. Its totient is φ = 10325898576.

The previous prime is 20856805373. The next prime is 20856805379. The reversal of 20856805378 is 87350865802.

It is not an unprimeable number, because it can be changed into a prime (20856805373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48625 + ... + 209947.

It is an arithmetic number, because the mean of its divisors is an integer number (1974605760).

Almost surely, 2^20856805378 is an apocalyptic number.

20856805378 is a deficient number, since it is larger than the sum of its proper divisors (10736886782).

20856805378 is a wasteful number, since it uses less digits than its factorization.

20856805378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161961.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 20856805378 in words is "twenty billion, eight hundred fifty-six million, eight hundred five thousand, three hundred seventy-eight".