20203290 has 32 divisors (see below), whose sum is σ = 53876160. Its totient is φ = 5387472.

The previous prime is 20203277. The next prime is 20203297. The reversal of 20203290 is 9230202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20203297) 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 15 ways as a sum of consecutive naturals, for example, 37144 + ... + 37683.

It is an arithmetic number, because the mean of its divisors is an integer number (1683630).

Almost surely, 2^20203290 is an apocalyptic number.

20203290 is an abundant number, since it is smaller than the sum of its proper divisors (33672870).

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

20203290 is a wasteful number, since it uses less digits than its factorization.

20203290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74843 (or 74837 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20203290 is about 4494.8070036432. The cubic root of 20203290 is about 272.3583530034.

Adding to 20203290 its reverse (9230202), we get a palindrome (29433492).

The spelling of 20203290 in words is "twenty million, two hundred three thousand, two hundred ninety".