20440234 has 8 divisors (see below), whose sum is σ = 30775140. Its totient is φ = 10181856.

The previous prime is 20440213. The next prime is 20440249. The reversal of 20440234 is 43204402.

It can be written as a sum of positive squares in 2 ways, for example, as 14175225 + 6265009 = 3765^2 + 2503^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18459 + ... + 19534.

Almost surely, 2^20440234 is an apocalyptic number.

20440234 is a deficient number, since it is larger than the sum of its proper divisors (10334906).

20440234 is a wasteful number, since it uses less digits than its factorization.

20440234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38264.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20440234 is about 4521.0877009852. The cubic root of 20440234 is about 273.4189562543.

Adding to 20440234 its reverse (43204402), we get a palindrome (63644636).

The spelling of 20440234 in words is "twenty million, four hundred forty thousand, two hundred thirty-four".