20816434 has 8 divisors (see below), whose sum is σ = 31349808. Its totient is φ = 10366500.

The previous prime is 20816413. The next prime is 20816437. The reversal of 20816434 is 43461802.

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

It is not an unprimeable number, because it can be changed into a prime (20816437) 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, 20232 + ... + 21235.

It is an arithmetic number, because the mean of its divisors is an integer number (3918726).

Almost surely, 2^20816434 is an apocalyptic number.

20816434 is a deficient number, since it is larger than the sum of its proper divisors (10533374).

20816434 is a wasteful number, since it uses less digits than its factorization.

20816434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41720.

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

The square root of 20816434 is about 4562.5030410949. The cubic root of 20816434 is about 275.0861834561.

It can be divided in two parts, 2081 and 6434, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 20816434 in words is "twenty million, eight hundred sixteen thousand, four hundred thirty-four".