16820434 has 12 divisors (see below), whose sum is σ = 26629614. Its totient is φ = 7967232.

The previous prime is 16820431. The next prime is 16820437. The reversal of 16820434 is 43402861.

It is an interprime number because it is at equal distance from previous prime (16820431) and next prime (16820437).

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 442225 = 4047^2 + 665^2 .

It is not an unprimeable number, because it can be changed into a prime (16820431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10927 + ... + 12370.

Almost surely, 2^16820434 is an apocalyptic number.

16820434 is a deficient number, since it is larger than the sum of its proper divisors (9809180).

16820434 is a wasteful number, since it uses less digits than its factorization.

16820434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23337 (or 23318 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 16820434 is about 4101.2722416343. The cubic root of 16820434 is about 256.2196296349.

It can be divided in two parts, 168 and 20434, that added together give a palindrome (20602).

The spelling of 16820434 in words is "sixteen million, eight hundred twenty thousand, four hundred thirty-four".