19923902 has 4 divisors (see below), whose sum is σ = 29885856. Its totient is φ = 9961950.

The previous prime is 19923889. The next prime is 19923907. The reversal of 19923902 is 20932991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19923907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980974 + ... + 4980977.

It is an arithmetic number, because the mean of its divisors is an integer number (7471464).

Almost surely, 2^19923902 is an apocalyptic number.

19923902 is a deficient number, since it is larger than the sum of its proper divisors (9961954).

19923902 is an equidigital number, since it uses as much as digits as its factorization.

19923902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9961953.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 19923902 is about 4463.6198314821. The cubic root of 19923902 is about 271.0970545107.

The spelling of 19923902 in words is "nineteen million, nine hundred twenty-three thousand, nine hundred two".