20356671394 has 16 divisors (see below), whose sum is σ = 31594416120. Its totient is φ = 9825343360.

The previous prime is 20356671353. The next prime is 20356671397. The reversal of 20356671394 is 49317665302.

It can be written as a sum of positive squares in 4 ways, for example, as 20276336025 + 80335369 = 142395^2 + 8963^2 .

It is not an unprimeable number, because it can be changed into a prime (20356671397) 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, 271782 + ... + 338494.

Almost surely, 2^20356671394 is an apocalyptic number.

20356671394 is a deficient number, since it is larger than the sum of its proper divisors (11237744726).

20356671394 is a wasteful number, since it uses less digits than its factorization.

20356671394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72005.

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 20356671394 in words is "twenty billion, three hundred fifty-six million, six hundred seventy-one thousand, three hundred ninety-four".