20891904476 has 12 divisors (see below), whose sum is σ = 36806208600. Its totient is φ = 10375844880.

The previous prime is 20891904463. The next prime is 20891904533. The reversal of 20891904476 is 67440919802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17526170 + ... + 17527361.

It is an arithmetic number, because the mean of its divisors is an integer number (3067184050).

Almost surely, 2^20891904476 is an apocalyptic number.

It is an amenable number.

20891904476 is a deficient number, since it is larger than the sum of its proper divisors (15914304124).

20891904476 is a wasteful number, since it uses less digits than its factorization.

20891904476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35053684 (or 35053682 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 20891904476 in words is "twenty billion, eight hundred ninety-one million, nine hundred four thousand, four hundred seventy-six".