20803910401 has 4 divisors (see below), whose sum is σ = 20804782932. Its totient is φ = 20803037872.

The previous prime is 20803910399. The next prime is 20803910417. The reversal of 20803910401 is 10401930802.

It is a happy number.

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 6192903025 + 14611007376 = 78695^2 + 120876^2 .

It is a cyclic number.

It is not a de Polignac number, because 20803910401 - 2¹ = 20803910399 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 20803910401.

It is not an unprimeable number, because it can be changed into a prime (20803910431) 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 3 ways as a sum of consecutive naturals, for example, 399466 + ... + 448531.

It is an arithmetic number, because the mean of its divisors is an integer number (5201195733).

Almost surely, 2^20803910401 is an apocalyptic number.

It is an amenable number.

20803910401 is a deficient number, since it is larger than the sum of its proper divisors (872531).

20803910401 is an equidigital number, since it uses as much as digits as its factorization.

20803910401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872530.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 20803910401 in words is "twenty billion, eight hundred three million, nine hundred ten thousand, four hundred one".