20431654208 has 28 divisors (see below), whose sum is σ = 46336073952. Its totient is φ = 8756423040.

The previous prime is 20431654163. The next prime is 20431654213. The reversal of 20431654208 is 80245613402.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22802738 + ... + 22803633.

It is an arithmetic number, because the mean of its divisors is an integer number (1654859784).

Almost surely, 2^20431654208 is an apocalyptic number.

20431654208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20431654208 is an abundant number, since it is smaller than the sum of its proper divisors (25904419744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20431654208 is an equidigital number, since it uses as much as digits as its factorization.

20431654208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45606390 (or 45606380 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 20431654208 in words is "twenty billion, four hundred thirty-one million, six hundred fifty-four thousand, two hundred eight".