202019990 has 16 divisors (see below), whose sum is σ = 365055552. Its totient is φ = 80492544.

The previous prime is 202019969. The next prime is 202020019. The reversal of 202019990 is 99910202.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 36734 + ... + 41873.

It is an arithmetic number, because the mean of its divisors is an integer number (22815972).

Almost surely, 2^202019990 is an apocalyptic number.

202019990 is a deficient number, since it is larger than the sum of its proper divisors (163035562).

202019990 is a wasteful number, since it uses less digits than its factorization.

202019990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78871.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 202019990 is about 14213.3736319003. The cubic root of 202019990 is about 586.7657850922.

The spelling of 202019990 in words is "two hundred two million, nineteen thousand, nine hundred ninety".