20646442 has 16 divisors (see below), whose sum is σ = 31852800. Its totient is φ = 10032048.

The previous prime is 20646421. The next prime is 20646443. The reversal of 20646442 is 24464602.

It is a self number, because there is not a number n which added to its sum of digits gives 20646442.

It is not an unprimeable number, because it can be changed into a prime (20646443) 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 7 ways as a sum of consecutive naturals, for example, 14059 + ... + 15457.

It is an arithmetic number, because the mean of its divisors is an integer number (1990800).

Almost surely, 2^20646442 is an apocalyptic number.

20646442 is a deficient number, since it is larger than the sum of its proper divisors (11206358).

20646442 is a wasteful number, since it uses less digits than its factorization.

20646442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 20646442 is about 4543.8356044206. The cubic root of 20646442 is about 274.3353292305.

The spelling of 20646442 in words is "twenty million, six hundred forty-six thousand, four hundred forty-two".