20840699 has 4 divisors (see below), whose sum is σ = 22735320. Its totient is φ = 18946080.

The previous prime is 20840683. The next prime is 20840707. The reversal of 20840699 is 99604802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20840699 - 2⁴ = 20840683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20840609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947294 + ... + 947315.

It is an arithmetic number, because the mean of its divisors is an integer number (5683830).

Almost surely, 2^20840699 is an apocalyptic number.

20840699 is a deficient number, since it is larger than the sum of its proper divisors (1894621).

20840699 is a wasteful number, since it uses less digits than its factorization.

20840699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894620.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20840699 is about 4565.1614429284. The cubic root of 20840699 is about 275.1930281143.

The spelling of 20840699 in words is "twenty million, eight hundred forty thousand, six hundred ninety-nine".