20354505787 has 16 divisors (see below), whose sum is σ = 25855863552. Its totient is φ = 15561393120.

The previous prime is 20354505751. The next prime is 20354505793. The reversal of 20354505787 is 78750545302.

It is not a de Polignac number, because 20354505787 - 2²⁷ = 20220288059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20354545787) 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 15 ways as a sum of consecutive naturals, for example, 2489733 + ... + 2497894.

It is an arithmetic number, because the mean of its divisors is an integer number (1615991472).

Almost surely, 2^20354505787 is an apocalyptic number.

20354505787 is a deficient number, since it is larger than the sum of its proper divisors (5501357765).

20354505787 is a wasteful number, since it uses less digits than its factorization.

20354505787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4987698.

The product of its (nonzero) digits is 1176000, while the sum is 46.

The spelling of 20354505787 in words is "twenty billion, three hundred fifty-four million, five hundred five thousand, seven hundred eighty-seven".