20247434 has 4 divisors (see below), whose sum is σ = 30371154. Its totient is φ = 10123716.

The previous prime is 20247421. The next prime is 20247449. The reversal of 20247434 is 43474202.

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., 17347225 + 2900209 = 4165^2 + 1703^2 .

It is a Curzon number.

It is an unprimeable number.

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, 5061857 + ... + 5061860.

Almost surely, 2^20247434 is an apocalyptic number.

20247434 is a deficient number, since it is larger than the sum of its proper divisors (10123720).

20247434 is a wasteful number, since it uses less digits than its factorization.

20247434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10123719.

The product of its (nonzero) digits is 5376, while the sum is 26.

The square root of 20247434 is about 4499.7148798563. The cubic root of 20247434 is about 272.5565755214.

The spelling of 20247434 in words is "twenty million, two hundred forty-seven thousand, four hundred thirty-four".