20378939 has 8 divisors (see below), whose sum is σ = 23393760. Its totient is φ = 17390016.

The previous prime is 20378933. The next prime is 20378951. The reversal of 20378939 is 93987302.

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

It is a de Polignac number, because none of the positive numbers 2^k-20378939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20378896 and 20378905.

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 7 ways as a sum of consecutive naturals, for example, 4754 + ... + 7959.

It is an arithmetic number, because the mean of its divisors is an integer number (2924220).

Almost surely, 2^20378939 is an apocalyptic number.

20378939 is a deficient number, since it is larger than the sum of its proper divisors (3014821).

20378939 is a wasteful number, since it uses less digits than its factorization.

20378939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12949.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 20378939 is about 4514.3038222964. The cubic root of 20378939 is about 273.1453782532.

The spelling of 20378939 in words is "twenty million, three hundred seventy-eight thousand, nine hundred thirty-nine".