20779612249 has 4 divisors (see below), whose sum is σ = 22668667920. Its totient is φ = 18890556580.

The previous prime is 20779612163. The next prime is 20779612253. The reversal of 20779612249 is 94221697702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20779612249 - 2¹³ = 20779604057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20779612349) 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, 944527819 + ... + 944527840.

It is an arithmetic number, because the mean of its divisors is an integer number (5667166980).

Almost surely, 2^20779612249 is an apocalyptic number.

It is an amenable number.

20779612249 is a deficient number, since it is larger than the sum of its proper divisors (1889055671).

20779612249 is a wasteful number, since it uses less digits than its factorization.

20779612249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889055670.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 20779612249 in words is "twenty billion, seven hundred seventy-nine million, six hundred twelve thousand, two hundred forty-nine".