20378839 has 4 divisors (see below), whose sum is σ = 21946456. Its totient is φ = 18811224.

The previous prime is 20378837. The next prime is 20378863. The reversal of 20378839 is 93887302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93887302 = 2 ⋅46943651.

It is a cyclic number.

It is not a de Polignac number, because 20378839 - 2¹ = 20378837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20378837) 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, 783789 + ... + 783814.

It is an arithmetic number, because the mean of its divisors is an integer number (5486614).

Almost surely, 2^20378839 is an apocalyptic number.

20378839 is a deficient number, since it is larger than the sum of its proper divisors (1567617).

20378839 is a wasteful number, since it uses less digits than its factorization.

20378839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567616.

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

The square root of 20378839 is about 4514.2927463779. The cubic root of 20378839 is about 273.1449314752.

The spelling of 20378839 in words is "twenty million, three hundred seventy-eight thousand, eight hundred thirty-nine".