20646134 has 8 divisors (see below), whose sum is σ = 32315760. Its totient is φ = 9874216.

The previous prime is 20646107. The next prime is 20646137. The reversal of 20646134 is 43164602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646137) 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 in 3 ways as a sum of consecutive naturals, for example, 224369 + ... + 224460.

It is an arithmetic number, because the mean of its divisors is an integer number (4039470).

Almost surely, 2^20646134 is an apocalyptic number.

20646134 is a deficient number, since it is larger than the sum of its proper divisors (11669626).

20646134 is a wasteful number, since it uses less digits than its factorization.

20646134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448854.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20646134 is about 4543.8017122229. The cubic root of 20646134 is about 274.3339650616. Note that the first 3 decimals are identical.

The spelling of 20646134 in words is "twenty million, six hundred forty-six thousand, one hundred thirty-four".