20138378 has 12 divisors (see below), whose sum is σ = 32710518. Its totient is φ = 9294480.

The previous prime is 20138351. The next prime is 20138389. The reversal of 20138378 is 87383102.

It can be written as a sum of positive squares in 3 ways, for example, as 12482089 + 7656289 = 3533^2 + 2767^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29453 + ... + 30128.

Almost surely, 2^20138378 is an apocalyptic number.

20138378 is a deficient number, since it is larger than the sum of its proper divisors (12572140).

20138378 is a wasteful number, since it uses less digits than its factorization.

20138378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59609 (or 59596 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20138378 is about 4487.5804171068. The cubic root of 20138378 is about 272.0663495146.

The spelling of 20138378 in words is "twenty million, one hundred thirty-eight thousand, three hundred seventy-eight".