20190890 has 8 divisors (see below), whose sum is σ = 36343620. Its totient is φ = 8076352.

The previous prime is 20190881. The next prime is 20190893. The reversal of 20190890 is 9809102.

It can be written as a sum of positive squares in 2 ways, for example, as 19864849 + 326041 = 4457^2 + 571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20190893) 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 3 ways as a sum of consecutive naturals, for example, 1009535 + ... + 1009554.

Almost surely, 2^20190890 is an apocalyptic number.

20190890 is a deficient number, since it is larger than the sum of its proper divisors (16152730).

20190890 is a wasteful number, since it uses less digits than its factorization.

20190890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019096.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 20190890 is about 4493.4274223581. The cubic root of 20190890 is about 272.3026205830.

Adding to 20190890 its reverse (9809102), we get a palindrome (29999992).

The spelling of 20190890 in words is "twenty million, one hundred ninety thousand, eight hundred ninety".