20321099 has 8 divisors (see below), whose sum is σ = 20658672. Its totient is φ = 19986400.

The previous prime is 20321087. The next prime is 20321131. The reversal of 20321099 is 99012302.

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

It is a cyclic number.

It is not a de Polignac number, because 20321099 - 2¹⁶ = 20255563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16892 + ... + 18054.

It is an arithmetic number, because the mean of its divisors is an integer number (2582334).

Almost surely, 2^20321099 is an apocalyptic number.

20321099 is a deficient number, since it is larger than the sum of its proper divisors (337573).

20321099 is a wasteful number, since it uses less digits than its factorization.

20321099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20321099 is about 4507.8929667861. The cubic root of 20321099 is about 272.8867174356.

The spelling of 20321099 in words is "twenty million, three hundred twenty-one thousand, ninety-nine".