20127434 has 4 divisors (see below), whose sum is σ = 30191154. Its totient is φ = 10063716.

The previous prime is 20127431. The next prime is 20127451. The reversal of 20127434 is 43472102.

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., 19492225 + 635209 = 4415^2 + 797^2 .

It is a super-2 number, since 2×20127434² = 810227198848712, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20127431) 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, 5031857 + ... + 5031860.

Almost surely, 2^20127434 is an apocalyptic number.

20127434 is a deficient number, since it is larger than the sum of its proper divisors (10063720).

20127434 is a wasteful number, since it uses less digits than its factorization.

20127434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10063719.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20127434 is about 4486.3608860634. The cubic root of 20127434 is about 272.0170566726.

Adding to 20127434 its reverse (43472102), we get a palindrome (63599536).

The spelling of 20127434 in words is "twenty million, one hundred twenty-seven thousand, four hundred thirty-four".