20203680949 has 4 divisors (see below), whose sum is σ = 20291906860. Its totient is φ = 20115455040.

The previous prime is 20203680929. The next prime is 20203680967. The reversal of 20203680949 is 94908630202.

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 19601960049 + 601720900 = 140007^2 + 24530^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203680949 - 2¹³ = 20203672757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203680929) 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, 44112612 + ... + 44113069.

It is an arithmetic number, because the mean of its divisors is an integer number (5072976715).

Almost surely, 2^20203680949 is an apocalyptic number.

It is an amenable number.

20203680949 is a deficient number, since it is larger than the sum of its proper divisors (88225911).

20203680949 is an equidigital number, since it uses as much as digits as its factorization.

20203680949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88225910.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 20203680949 in words is "twenty billion, two hundred three million, six hundred eighty thousand, nine hundred forty-nine".