20499801 has 16 divisors (see below), whose sum is σ = 31309824. Its totient is φ = 11687184.

The previous prime is 20499799. The next prime is 20499827. The reversal of 20499801 is 10899402.

It is not a de Polignac number, because 20499801 - 2¹ = 20499799 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20499001) 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, 11496 + ... + 13158.

It is an arithmetic number, because the mean of its divisors is an integer number (1956864).

Almost surely, 2^20499801 is an apocalyptic number.

20499801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20499801 is a deficient number, since it is larger than the sum of its proper divisors (10810023).

20499801 is a wasteful number, since it uses less digits than its factorization.

20499801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20499801 is about 4527.6705931417. The cubic root of 20499801 is about 273.6842981541.

The spelling of 20499801 in words is "twenty million, four hundred ninety-nine thousand, eight hundred one".