20504476641 has 16 divisors (see below), whose sum is σ = 29845632960. Its totient is φ = 12418230720.

The previous prime is 20504476631. The next prime is 20504476669. The reversal of 20504476641 is 14667440502.

It is not a de Polignac number, because 20504476641 - 2¹⁷ = 20504345569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20504476641.

It is not an unprimeable number, because it can be changed into a prime (20504476631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170250 + ... + 264563.

It is an arithmetic number, because the mean of its divisors is an integer number (1865352060).

Almost surely, 2^20504476641 is an apocalyptic number.

It is an amenable number.

20504476641 is a deficient number, since it is larger than the sum of its proper divisors (9341156319).

20504476641 is a wasteful number, since it uses less digits than its factorization.

20504476641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436256.

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 20504476641 in words is "twenty billion, five hundred four million, four hundred seventy-six thousand, six hundred forty-one".