20804152 has 8 divisors (see below), whose sum is σ = 39007800. Its totient is φ = 10402072.

The previous prime is 20804149. The next prime is 20804159. The reversal of 20804152 is 25140802.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804159) 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 as a sum of consecutive naturals, namely, 1300252 + ... + 1300267.

It is an arithmetic number, because the mean of its divisors is an integer number (4875975).

Almost surely, 2^20804152 is an apocalyptic number.

It is an amenable number.

20804152 is a deficient number, since it is larger than the sum of its proper divisors (18203648).

20804152 is a wasteful number, since it uses less digits than its factorization.

20804152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600525 (or 2600521 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20804152 is about 4561.1568707950. The cubic root of 20804152 is about 275.0320711908.

Adding to 20804152 its reverse (25140802), we get a palindrome (45944954).

The spelling of 20804152 in words is "twenty million, eight hundred four thousand, one hundred fifty-two".