20797090 has 8 divisors (see below), whose sum is σ = 37434780. Its totient is φ = 8318832.

The previous prime is 20797057. The next prime is 20797109. The reversal of 20797090 is 9079702.

It can be written as a sum of positive squares in 2 ways, for example, as 20548089 + 249001 = 4533^2 + 499^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 1039845 + ... + 1039864.

Almost surely, 2^20797090 is an apocalyptic number.

20797090 is a deficient number, since it is larger than the sum of its proper divisors (16637690).

20797090 is a wasteful number, since it uses less digits than its factorization.

20797090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079716.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 20797090 is about 4560.3826593829. The cubic root of 20797090 is about 275.0009476551. Note that the first 3 decimals are identical.

The spelling of 20797090 in words is "twenty million, seven hundred ninety-seven thousand, ninety".