20786375849 has 4 divisors (see below), whose sum is σ = 21503147460. Its totient is φ = 20069604240.

The previous prime is 20786375809. The next prime is 20786375851. The reversal of 20786375849 is 94857368702.

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 6795034624 + 13991341225 = 82432^2 + 118285^2 .

It is a cyclic number.

It is not a de Polignac number, because 20786375849 - 2¹⁶ = 20786310313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20786375809) 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, 358385762 + ... + 358385819.

It is an arithmetic number, because the mean of its divisors is an integer number (5375786865).

Almost surely, 2^20786375849 is an apocalyptic number.

20786375849 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20786375849 is a deficient number, since it is larger than the sum of its proper divisors (716771611).

20786375849 is an equidigital number, since it uses as much as digits as its factorization.

20786375849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716771610.

The product of its (nonzero) digits is 20321280, while the sum is 59.

The spelling of 20786375849 in words is "twenty billion, seven hundred eighty-six million, three hundred seventy-five thousand, eight hundred forty-nine".