20039902 has 4 divisors (see below), whose sum is σ = 30059856. Its totient is φ = 10019950.

The previous prime is 20039893. The next prime is 20039933. The reversal of 20039902 is 20993002.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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, 5009974 + ... + 5009977.

It is an arithmetic number, because the mean of its divisors is an integer number (7514964).

Almost surely, 2^20039902 is an apocalyptic number.

20039902 is a deficient number, since it is larger than the sum of its proper divisors (10019954).

20039902 is a wasteful number, since it uses less digits than its factorization.

20039902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10019953.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20039902 is about 4476.5949113137. The cubic root of 20039902 is about 271.6221595616.

The spelling of 20039902 in words is "twenty million, thirty-nine thousand, nine hundred two".