20842838 has 8 divisors (see below), whose sum is σ = 31291920. Its totient is φ = 10412200.

The previous prime is 20842837. The next prime is 20842847. The reversal of 20842838 is 83824802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20842798 and 20842807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842837) 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, 1313 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (3911490).

Almost surely, 2^20842838 is an apocalyptic number.

20842838 is a deficient number, since it is larger than the sum of its proper divisors (10449082).

20842838 is a wasteful number, since it uses less digits than its factorization.

20842838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9222.

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 20842838 is about 4565.3957112172. The cubic root of 20842838 is about 275.2024426698.

The spelling of 20842838 in words is "twenty million, eight hundred forty-two thousand, eight hundred thirty-eight".