20438378 has 8 divisors (see below), whose sum is σ = 30690660. Its totient is φ = 10208160.

The previous prime is 20438371. The next prime is 20438387. The reversal of 20438378 is 87383402.

It can be written as a sum of positive squares in 2 ways, for example, as 17280649 + 3157729 = 4157^2 + 1777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20438371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2963 + ... + 7046.

Almost surely, 2^20438378 is an apocalyptic number.

20438378 is a deficient number, since it is larger than the sum of its proper divisors (10252282).

20438378 is a wasteful number, since it uses less digits than its factorization.

20438378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11032.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 20438378 is about 4520.8824359853. The cubic root of 20438378 is about 273.4106804041.

The spelling of 20438378 in words is "twenty million, four hundred thirty-eight thousand, three hundred seventy-eight".