20329451999 has 8 divisors (see below), whose sum is σ = 20463924240. Its totient is φ = 20195416576.

The previous prime is 20329451969. The next prime is 20329452007. The reversal of 20329451999 is 99915492302.

It is a happy number.

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 20329451999 - 2¹⁶ = 20329386463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20329451999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20329451929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15554 + ... + 202239.

It is an arithmetic number, because the mean of its divisors is an integer number (2557990530).

Almost surely, 2^20329451999 is an apocalyptic number.

20329451999 is a deficient number, since it is larger than the sum of its proper divisors (134472241).

20329451999 is a wasteful number, since it uses less digits than its factorization.

20329451999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218409.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The spelling of 20329451999 in words is "twenty billion, three hundred twenty-nine million, four hundred fifty-one thousand, nine hundred ninety-nine".