202001990 has 16 divisors (see below), whose sum is σ = 384992352. Its totient is φ = 76047744.

The previous prime is 202001959. The next prime is 202001999. The reversal of 202001990 is 99100202.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202001999) 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 in 7 ways as a sum of consecutive naturals, for example, 593954 + ... + 594293.

It is an arithmetic number, because the mean of its divisors is an integer number (24062022).

Almost surely, 2^202001990 is an apocalyptic number.

202001990 is a deficient number, since it is larger than the sum of its proper divisors (182990362).

202001990 is a wasteful number, since it uses less digits than its factorization.

202001990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188271.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 202001990 is about 14212.7404113352. The cubic root of 202001990 is about 586.7483576125.

The spelling of 202001990 in words is "two hundred two million, one thousand, nine hundred ninety".