20646104 has 16 divisors (see below), whose sum is σ = 38885400. Its totient is φ = 10276672.

The previous prime is 20646091. The next prime is 20646107. The reversal of 20646104 is 40164602.

It is a happy number.

It is a super-2 number, since 2×20646104² = 852523220757632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20646104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3869 + ... + 7500.

Almost surely, 2^20646104 is an apocalyptic number.

It is an amenable number.

20646104 is a deficient number, since it is larger than the sum of its proper divisors (18239296).

20646104 is a wasteful number, since it uses less digits than its factorization.

20646104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11602 (or 11598 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20646104 is about 4543.7984110213. The cubic root of 20646104 is about 274.3338321873. Note that the first 3 decimals are identical.

The spelling of 20646104 in words is "twenty million, six hundred forty-six thousand, one hundred four".