20839242 has 16 divisors (see below), whose sum is σ = 43490880. Its totient is φ = 6644352.

The previous prime is 20839201. The next prime is 20839243. The reversal of 20839242 is 24293802.

20839242 is nontrivially palindromic in base 12.

It is not an unprimeable number, because it can be changed into a prime (20839243) 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, 75367 + ... + 75642.

It is an arithmetic number, because the mean of its divisors is an integer number (2718180).

Almost surely, 2^20839242 is an apocalyptic number.

20839242 is an abundant number, since it is smaller than the sum of its proper divisors (22651638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20839242 is a wasteful number, since it uses less digits than its factorization.

20839242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151037.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20839242 is about 4565.0018619930. The cubic root of 20839242 is about 275.1866149323.

It can be divided in two parts, 2083 and 9242, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 20839242 in words is "twenty million, eight hundred thirty-nine thousand, two hundred forty-two".