20854601709 has 16 divisors (see below), whose sum is σ = 29530762560. Its totient is φ = 13045697280.

The previous prime is 20854601707. The next prime is 20854601717. The reversal of 20854601709 is 90710645802.

It is not a de Polignac number, because 20854601709 - 2¹ = 20854601707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20854601707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 600814 + ... + 634575.

It is an arithmetic number, because the mean of its divisors is an integer number (1845672660).

Almost surely, 2^20854601709 is an apocalyptic number.

It is an amenable number.

20854601709 is a deficient number, since it is larger than the sum of its proper divisors (8676160851).

20854601709 is a wasteful number, since it uses less digits than its factorization.

20854601709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235740.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 20854601709 in words is "twenty billion, eight hundred fifty-four million, six hundred one thousand, seven hundred nine".