202020090 has 32 divisors (see below), whose sum is σ = 501569280. Its totient is φ = 52014144.

The previous prime is 202020089. The next prime is 202020113. The reversal of 202020090 is 90020202.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 in 15 ways as a sum of consecutive naturals, for example, 115234 + ... + 116973.

It is an arithmetic number, because the mean of its divisors is an integer number (15674040).

Almost surely, 2^202020090 is an apocalyptic number.

202020090 is an abundant number, since it is smaller than the sum of its proper divisors (299549190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

202020090 is a wasteful number, since it uses less digits than its factorization.

202020090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232246.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 202020090 is about 14213.3771497136. The cubic root of 202020090 is about 586.7658819087.

Adding to 202020090 its reverse (90020202), we get a palindrome (292040292).

The spelling of 202020090 in words is "two hundred two million, twenty thousand, ninety".