20840193 has 24 divisors (see below), whose sum is σ = 33941600. Its totient is φ = 12628440.

The previous prime is 20840173. The next prime is 20840233. The reversal of 20840193 is 39104802.

It is not a de Polignac number, because 20840193 - 2⁸ = 20839937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20840123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78 + ... + 6456.

Almost surely, 2^20840193 is an apocalyptic number.

It is an amenable number.

20840193 is a deficient number, since it is larger than the sum of its proper divisors (13101407).

20840193 is a wasteful number, since it uses less digits than its factorization.

20840193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6410 (or 6393 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20840193 is about 4565.1060228652. The cubic root of 20840193 is about 275.1908009209.

Adding to 20840193 its reverse (39104802), we get a palindrome (59944995).

It can be divided in two parts, 208 and 40193, that added together give a square (40401 = 201²).

The spelling of 20840193 in words is "twenty million, eight hundred forty thousand, one hundred ninety-three".