20253434 has 4 divisors (see below), whose sum is σ = 30380154. Its totient is φ = 10126716.

The previous prime is 20253433. The next prime is 20253439. The reversal of 20253434 is 43435202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43435202 = 2 ⋅21717601.

It can be written as a sum of positive squares in only one way, i.e., 11580409 + 8673025 = 3403^2 + 2945^2 .

It is not an unprimeable number, because it can be changed into a prime (20253433) 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, 5063357 + ... + 5063360.

Almost surely, 2^20253434 is an apocalyptic number.

20253434 is a deficient number, since it is larger than the sum of its proper divisors (10126720).

20253434 is a wasteful number, since it uses less digits than its factorization.

20253434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126719.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 20253434 is about 4500.3815393809. The cubic root of 20253434 is about 272.5834954419.

Adding to 20253434 its reverse (43435202), we get a palindrome (63688636).

The spelling of 20253434 in words is "twenty million, two hundred fifty-three thousand, four hundred thirty-four".