20097890 has 8 divisors (see below), whose sum is σ = 36176220. Its totient is φ = 8039152.

The previous prime is 20097823. The next prime is 20097901. The reversal of 20097890 is 9879002.

It can be written as a sum of positive squares in 2 ways, for example, as 16752649 + 3345241 = 4093^2 + 1829^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20097890.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1004885 + ... + 1004904.

Almost surely, 2^20097890 is an apocalyptic number.

20097890 is a deficient number, since it is larger than the sum of its proper divisors (16078330).

20097890 is a wasteful number, since it uses less digits than its factorization.

20097890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009796.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 20097890 is about 4483.0670305049. The cubic root of 20097890 is about 271.8838983303.

The spelling of 20097890 in words is "twenty million, ninety-seven thousand, eight hundred ninety".