20204057646 has 12 divisors (see below), whose sum is σ = 43775458272. Its totient is φ = 6734685876.

The previous prime is 20204057639. The next prime is 20204057651. The reversal of 20204057646 is 64675040202.

20204057646 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 4 + 0 + 5 + 7 + 646 = 666.

It is a super-2 number, since 2×20204057646² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20204057646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561223806 + ... + 561223841.

It is an arithmetic number, because the mean of its divisors is an integer number (3647954856).

Almost surely, 2^20204057646 is an apocalyptic number.

20204057646 is an abundant number, since it is smaller than the sum of its proper divisors (23571400626).

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

20204057646 is a wasteful number, since it uses less digits than its factorization.

20204057646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122447655 (or 1122447652 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

Adding to 20204057646 its reverse (64675040202), we get a palindrome (84879097848).

The spelling of 20204057646 in words is "twenty billion, two hundred four million, fifty-seven thousand, six hundred forty-six".