20400386896 has 40 divisors (see below), whose sum is σ = 40690933064. Its totient is φ = 9900817920.

The previous prime is 20400386891. The next prime is 20400386977. The reversal of 20400386896 is 69868300402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4816360000 + 15584026896 = 69400^2 + 124836^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400386891) 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, 208306 + ... + 290158.

Almost surely, 2^20400386896 is an apocalyptic number.

It is an amenable number.

20400386896 is a deficient number, since it is larger than the sum of its proper divisors (20290546168).

20400386896 is a wasteful number, since it uses less digits than its factorization.

20400386896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82319 (or 82313 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 20400386896 in words is "twenty billion, four hundred million, three hundred eighty-six thousand, eight hundred ninety-six".