20456799 has 16 divisors (see below), whose sum is σ = 29896320. Its totient is φ = 12339360.

The previous prime is 20456791. The next prime is 20456809. The reversal of 20456799 is 99765402.

It is not a de Polignac number, because 20456799 - 2³ = 20456791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20456799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456791) 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 15 ways as a sum of consecutive naturals, for example, 6204 + ... + 8910.

It is an arithmetic number, because the mean of its divisors is an integer number (1868520).

Almost surely, 2^20456799 is an apocalyptic number.

20456799 is a deficient number, since it is larger than the sum of its proper divisors (9439521).

20456799 is a wasteful number, since it uses less digits than its factorization.

20456799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 20456799 is about 4522.9193006287. The cubic root of 20456799 is about 273.4927969298.

The spelling of 20456799 in words is "twenty million, four hundred fifty-six thousand, seven hundred ninety-nine".