20840190193 has 4 divisors (see below), whose sum is σ = 20840490148. Its totient is φ = 20839890240.

The previous prime is 20840190187. The next prime is 20840190211. The reversal of 20840190193 is 39109104802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9515612304 + 11324577889 = 97548^2 + 106417^2 .

It is a cyclic number.

It is not a de Polignac number, because 20840190193 - 2¹³ = 20840182001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20840190143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14005 + ... + 204637.

It is an arithmetic number, because the mean of its divisors is an integer number (5210122537).

Almost surely, 2^20840190193 is an apocalyptic number.

It is an amenable number.

20840190193 is a deficient number, since it is larger than the sum of its proper divisors (299955).

20840190193 is a wasteful number, since it uses less digits than its factorization.

20840190193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299954.

The product of its (nonzero) digits is 15552, while the sum is 37.

Adding to 20840190193 its reverse (39109104802), we get a palindrome (59949294995).

The spelling of 20840190193 in words is "twenty billion, eight hundred forty million, one hundred ninety thousand, one hundred ninety-three".