20840594 has 8 divisors (see below), whose sum is σ = 31281228. Its totient is φ = 10413520.

The previous prime is 20840593. The next prime is 20840609. The reversal of 20840594 is 49504802.

It can be written as a sum of positive squares in 2 ways, for example, as 20839225 + 1369 = 4565^2 + 37^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20840594.

It is not an unprimeable number, because it can be changed into a prime (20840591) 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, 2504 + ... + 6924.

Almost surely, 2^20840594 is an apocalyptic number.

20840594 is a deficient number, since it is larger than the sum of its proper divisors (10440634).

20840594 is a wasteful number, since it uses less digits than its factorization.

20840594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20840594 is about 4565.1499427730. The cubic root of 20840594 is about 275.1925659526.

The spelling of 20840594 in words is "twenty million, eight hundred forty thousand, five hundred ninety-four".