20640774323 has 8 divisors (see below), whose sum is σ = 22238337408. Its totient is φ = 19044612864.

The previous prime is 20640774313. The next prime is 20640774377. The reversal of 20640774323 is 32347704602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20640774323 - 2⁸ = 20640774067 is a prime.

It is a super-2 number, since 2×20640774323² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (20640774313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319715 + ... + 378812.

It is an arithmetic number, because the mean of its divisors is an integer number (2779792176).

Almost surely, 2^20640774323 is an apocalyptic number.

20640774323 is a deficient number, since it is larger than the sum of its proper divisors (1597563085).

20640774323 is a wasteful number, since it uses less digits than its factorization.

20640774323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700813.

The product of its (nonzero) digits is 169344, while the sum is 38.

The spelling of 20640774323 in words is "twenty billion, six hundred forty million, seven hundred seventy-four thousand, three hundred twenty-three".