20340890 has 16 divisors (see below), whose sum is σ = 37876680. Its totient is φ = 7855680.

The previous prime is 20340871. The next prime is 20340907. The reversal of 20340890 is 9804302.

It can be written as a sum of positive squares in 4 ways, for example, as 18003049 + 2337841 = 4243^2 + 1529^2 .

It is an unprimeable number.

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, 34781 + ... + 35360.

Almost surely, 2^20340890 is an apocalyptic number.

20340890 is a deficient number, since it is larger than the sum of its proper divisors (17535790).

20340890 is a wasteful number, since it uses less digits than its factorization.

20340890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70177.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20340890 is about 4510.0875822982. The cubic root of 20340890 is about 272.9752780773.

The spelling of 20340890 in words is "twenty million, three hundred forty thousand, eight hundred ninety".