20999528423 has 4 divisors (see below), whose sum is σ = 21207444648. Its totient is φ = 20791612200.

The previous prime is 20999528413. The next prime is 20999528437. The reversal of 20999528423 is 32482599902.

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 20999528423 - 2¹² = 20999524327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20999528413) 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 3 ways as a sum of consecutive naturals, for example, 103957961 + ... + 103958162.

It is an arithmetic number, because the mean of its divisors is an integer number (5301861162).

Almost surely, 2^20999528423 is an apocalyptic number.

20999528423 is a deficient number, since it is larger than the sum of its proper divisors (207916225).

20999528423 is a wasteful number, since it uses less digits than its factorization.

20999528423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207916224.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 20999528423 in words is "twenty billion, nine hundred ninety-nine million, five hundred twenty-eight thousand, four hundred twenty-three".