20804200381 has 4 divisors (see below), whose sum is σ = 22027976892. Its totient is φ = 19580423872.

The previous prime is 20804200337. The next prime is 20804200387. The reversal of 20804200381 is 18300240802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18300240802 = 2 ⋅9150120401.

It can be written as a sum of positive squares in 2 ways, for example, as 17878364100 + 2925836281 = 133710^2 + 54091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20804200381 is a prime.

It is a super-2 number, since 2×20804200381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804200387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611888230 + ... + 611888263.

It is an arithmetic number, because the mean of its divisors is an integer number (5506994223).

Almost surely, 2^20804200381 is an apocalyptic number.

It is an amenable number.

20804200381 is a deficient number, since it is larger than the sum of its proper divisors (1223776511).

20804200381 is a wasteful number, since it uses less digits than its factorization.

20804200381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223776510.

The product of its (nonzero) digits is 3072, while the sum is 28.

The spelling of 20804200381 in words is "twenty billion, eight hundred four million, two hundred thousand, three hundred eighty-one".