20181434 has 64 divisors (see below), whose sum is σ = 39782400. Its totient is φ = 7620480.

The previous prime is 20181353. The next prime is 20181437. The reversal of 20181434 is 43418102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276422 + ... + 276494.

It is an arithmetic number, because the mean of its divisors is an integer number (621600).

Almost surely, 2^20181434 is an apocalyptic number.

20181434 is a deficient number, since it is larger than the sum of its proper divisors (19600966).

20181434 is a wasteful number, since it uses less digits than its factorization.

20181434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20181434 is about 4492.3750956482. The cubic root of 20181434 is about 272.2601047809.

Adding to 20181434 its reverse (43418102), we get a palindrome (63599536).

The spelling of 20181434 in words is "twenty million, one hundred eighty-one thousand, four hundred thirty-four".