20145305804 has 24 divisors (see below), whose sum is σ = 37971591168. Its totient is φ = 9296501760.

The previous prime is 20145305767. The next prime is 20145305819. The reversal of 20145305804 is 40850354102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402284 + ... + 449580.

It is an arithmetic number, because the mean of its divisors is an integer number (1582149632).

Almost surely, 2^20145305804 is an apocalyptic number.

It is an amenable number.

20145305804 is a deficient number, since it is larger than the sum of its proper divisors (17826285364).

20145305804 is a wasteful number, since it uses less digits than its factorization.

20145305804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55505 (or 55503 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 20145305804 its reverse (40850354102), we get a palindrome (60995659906).

The spelling of 20145305804 in words is "twenty billion, one hundred forty-five million, three hundred five thousand, eight hundred four".