20208538845 has 24 divisors (see below), whose sum is σ = 38212510752. Its totient is φ = 9798079200.

The previous prime is 20208538837. The next prime is 20208538849. The reversal of 20208538845 is 54883580202.

20208538845 is a `hidden beast` number, since 20 + 208 + 5 + 388 + 45 = 666.

It is not a de Polignac number, because 20208538845 - 2³ = 20208538837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20208538845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20208538849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20412171 + ... + 20413160.

It is an arithmetic number, because the mean of its divisors is an integer number (1592187948).

Almost surely, 2^20208538845 is an apocalyptic number.

It is an amenable number.

20208538845 is a deficient number, since it is larger than the sum of its proper divisors (18003971907).

20208538845 is a wasteful number, since it uses less digits than its factorization.

20208538845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40825353 (or 40825350 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 20208538845 in words is "twenty billion, two hundred eight million, five hundred thirty-eight thousand, eight hundred forty-five".