20840093 has 16 divisors (see below), whose sum is σ = 23162880. Its totient is φ = 18661104.

The previous prime is 20840087. The next prime is 20840107. The reversal of 20840093 is 39004802.

It is a cyclic number.

It is not a de Polignac number, because 20840093 - 2²⁰ = 19791517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20840033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44780 + ... + 45242.

It is an arithmetic number, because the mean of its divisors is an integer number (1447680).

Almost surely, 2^20840093 is an apocalyptic number.

20840093 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20840093 is a deficient number, since it is larger than the sum of its proper divisors (2322787).

20840093 is a wasteful number, since it uses less digits than its factorization.

20840093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608.

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

The square root of 20840093 is about 4565.0950702039. The cubic root of 20840093 is about 275.1903607599.

Adding to 20840093 its reverse (39004802), we get a palindrome (59844895).

The spelling of 20840093 in words is "twenty million, eight hundred forty thousand, ninety-three".