20678434 has 8 divisors (see below), whose sum is σ = 35448768. Its totient is φ = 8862180.

The previous prime is 20678431. The next prime is 20678447. The reversal of 20678434 is 43487602.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20678434.

It is not an unprimeable number, because it can be changed into a prime (20678431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738502 + ... + 738529.

It is an arithmetic number, because the mean of its divisors is an integer number (4431096).

Almost surely, 2^20678434 is an apocalyptic number.

20678434 is a deficient number, since it is larger than the sum of its proper divisors (14770334).

20678434 is a wasteful number, since it uses less digits than its factorization.

20678434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477040.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 20678434 is about 4547.3546155980. The cubic root of 20678434 is about 274.4769518020.

It can be divided in two parts, 20678 and 434, that added together give a palindrome (21112).

The spelling of 20678434 in words is "twenty million, six hundred seventy-eight thousand, four hundred thirty-four".