20378938 has 8 divisors (see below), whose sum is σ = 31622580. Its totient is φ = 9838080.

The previous prime is 20378933. The next prime is 20378951. The reversal of 20378938 is 83987302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19864849 + 514089 = 4457^2 + 717^2 .

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

It is a super-2 number, since 2×20378938² = 830602228015688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20378938.

It is not an unprimeable number, because it can be changed into a prime (20378933) 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, 175623 + ... + 175738.

Almost surely, 2^20378938 is an apocalyptic number.

20378938 is a deficient number, since it is larger than the sum of its proper divisors (11243642).

20378938 is a wasteful number, since it uses less digits than its factorization.

20378938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351392.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20378938 is about 4514.3037115374. The cubic root of 20378938 is about 273.1453737854.

It can be divided in two parts, 20378 and 938, that added together give a square (21316 = 146²).

The spelling of 20378938 in words is "twenty million, three hundred seventy-eight thousand, nine hundred thirty-eight".