20802434 has 4 divisors (see below), whose sum is σ = 31203654. Its totient is φ = 10401216.

The previous prime is 20802427. The next prime is 20802437. The reversal of 20802434 is 43420802.

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., 17181025 + 3621409 = 4145^2 + 1903^2 .

It is not an unprimeable number, because it can be changed into a prime (20802437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5200607 + ... + 5200610.

Almost surely, 2^20802434 is an apocalyptic number.

20802434 is a deficient number, since it is larger than the sum of its proper divisors (10401220).

20802434 is a wasteful number, since it uses less digits than its factorization.

20802434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401219.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20802434 is about 4560.9685374929. The cubic root of 20802434 is about 275.0245002965.

The spelling of 20802434 in words is "twenty million, eight hundred two thousand, four hundred thirty-four".