20842834 has 4 divisors (see below), whose sum is σ = 31264254. Its totient is φ = 10421416.

The previous prime is 20842817. The next prime is 20842837. The reversal of 20842834 is 43824802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20115225 + 727609 = 4485^2 + 853^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20842796 and 20842805.

It is not an unprimeable number, because it can be changed into a prime (20842837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5210707 + ... + 5210710.

Almost surely, 2^20842834 is an apocalyptic number.

20842834 is a deficient number, since it is larger than the sum of its proper divisors (10421420).

20842834 is a wasteful number, since it uses less digits than its factorization.

20842834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10421419.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 20842834 is about 4565.3952731390. The cubic root of 20842834 is about 275.2024250648.

The spelling of 20842834 in words is "twenty million, eight hundred forty-two thousand, eight hundred thirty-four".