20903902 has 8 divisors (see below), whose sum is σ = 31410000. Its totient is φ = 10433904.

The previous prime is 20903899. The next prime is 20903903. The reversal of 20903902 is 20930902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20903903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7527 + ... + 9922.

It is an arithmetic number, because the mean of its divisors is an integer number (3926250).

Almost surely, 2^20903902 is an apocalyptic number.

20903902 is a deficient number, since it is larger than the sum of its proper divisors (10506098).

20903902 is a wasteful number, since it uses less digits than its factorization.

20903902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18050.

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

The square root of 20903902 is about 4572.0785207606. The cubic root of 20903902 is about 275.4709374121.

Subtracting 20903902 from its reverse (20930902), we obtain a cube (27000 = 30³).

The spelling of 20903902 in words is "twenty million, nine hundred three thousand, nine hundred two".