20388802 has 12 divisors (see below), whose sum is σ = 35576550. Its totient is φ = 8738016.

The previous prime is 20388779. The next prime is 20388803. The reversal of 20388802 is 20888302.

It can be written as a sum of positive squares in only one way, i.e., 11621281 + 8767521 = 3409^2 + 2961^2 .

It is not an unprimeable number, because it can be changed into a prime (20388803) 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 5 ways as a sum of consecutive naturals, for example, 103927 + ... + 104122.

Almost surely, 2^20388802 is an apocalyptic number.

20388802 is a deficient number, since it is larger than the sum of its proper divisors (15187748).

20388802 is a wasteful number, since it uses less digits than its factorization.

20388802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208065 (or 208058 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 20388802 is about 4515.3961066555. The cubic root of 20388802 is about 273.1894367845.

Subtracting 20388802 from its reverse (20888302), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 20388802 in words is "twenty million, three hundred eighty-eight thousand, eight hundred two".