20634744859 has 8 divisors (see below), whose sum is σ = 21194295408. Its totient is φ = 20075292000.

The previous prime is 20634744853. The next prime is 20634744869. The reversal of 20634744859 is 95844743602.

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 20634744859 - 2⁵ = 20634744827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20634744853) 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 7 ways as a sum of consecutive naturals, for example, 660009 + ... + 690565.

It is an arithmetic number, because the mean of its divisors is an integer number (2649286926).

Almost surely, 2^20634744859 is an apocalyptic number.

20634744859 is a deficient number, since it is larger than the sum of its proper divisors (559550549).

20634744859 is a wasteful number, since it uses less digits than its factorization.

20634744859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48845.

The product of its (nonzero) digits is 5806080, while the sum is 52.

The spelling of 20634744859 in words is "twenty billion, six hundred thirty-four million, seven hundred forty-four thousand, eight hundred fifty-nine".