20402804 has 12 divisors (see below), whose sum is σ = 35986944. Its totient is φ = 10120824.

The previous prime is 20402803. The next prime is 20402807. The reversal of 20402804 is 40820402.

It is a super-2 number, since 2×20402804² = 832548822124832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402801) 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, 19574 + ... + 20589.

It is an arithmetic number, because the mean of its divisors is an integer number (2998912).

Almost surely, 2^20402804 is an apocalyptic number.

It is an amenable number.

20402804 is a deficient number, since it is larger than the sum of its proper divisors (15584140).

20402804 is a wasteful number, since it uses less digits than its factorization.

20402804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40294 (or 40292 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20402804 is about 4516.9463136061. The cubic root of 20402804 is about 273.2519600456.

The spelling of 20402804 in words is "twenty million, four hundred two thousand, eight hundred four".