20824445401 has 4 divisors (see below), whose sum is σ = 20827297204. Its totient is φ = 20821593600.

The previous prime is 20824445353. The next prime is 20824445419. The reversal of 20824445401 is 10454442802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3214890000 + 17609555401 = 56700^2 + 132701^2 .

It is a cyclic number.

It is not a de Polignac number, because 20824445401 - 2¹⁹ = 20823921113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20824445431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1414920 + ... + 1429561.

It is an arithmetic number, because the mean of its divisors is an integer number (5206824301).

Almost surely, 2^20824445401 is an apocalyptic number.

It is an amenable number.

20824445401 is a deficient number, since it is larger than the sum of its proper divisors (2851803).

20824445401 is an equidigital number, since it uses as much as digits as its factorization.

20824445401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851802.

The product of its (nonzero) digits is 40960, while the sum is 34.

The spelling of 20824445401 in words is "twenty billion, eight hundred twenty-four million, four hundred forty-five thousand, four hundred one".