20400386837 has 4 divisors (see below), whose sum is σ = 20402876556. Its totient is φ = 20397897120.

The previous prime is 20400386833. The next prime is 20400386873. The reversal of 20400386837 is 73868300402.

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 19631932996 + 768453841 = 140114^2 + 27721^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400386837 - 2² = 20400386833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20400386794 and 20400386803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400386833) 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, 1232528 + ... + 1248969.

It is an arithmetic number, because the mean of its divisors is an integer number (5100719139).

Almost surely, 2^20400386837 is an apocalyptic number.

It is an amenable number.

20400386837 is a deficient number, since it is larger than the sum of its proper divisors (2489719).

20400386837 is an equidigital number, since it uses as much as digits as its factorization.

20400386837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489718.

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 20400386837 in words is "twenty billion, four hundred million, three hundred eighty-six thousand, eight hundred thirty-seven".