20177984993 has 4 divisors (see below), whose sum is σ = 20366564400. Its totient is φ = 19989405588.

The previous prime is 20177984989. The next prime is 20177985013. The reversal of 20177984993 is 39948977102.

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 20177984993 - 2² = 20177984989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20177987993) 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, 94289543 + ... + 94289756.

It is an arithmetic number, because the mean of its divisors is an integer number (5091641100).

Almost surely, 2^20177984993 is an apocalyptic number.

It is an amenable number.

20177984993 is a deficient number, since it is larger than the sum of its proper divisors (188579407).

20177984993 is a wasteful number, since it uses less digits than its factorization.

20177984993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188579406.

The product of its (nonzero) digits is 6858432, while the sum is 59.

The spelling of 20177984993 in words is "twenty billion, one hundred seventy-seven million, nine hundred eighty-four thousand, nine hundred ninety-three".