20891837504 has 28 divisors (see below), whose sum is σ = 41688867600. Its totient is φ = 10387555968.

The previous prime is 20891837497. The next prime is 20891837567. The reversal of 20891837504 is 40573819802.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900374 + ... + 923285.

Almost surely, 2^20891837504 is an apocalyptic number.

It is an amenable number.

20891837504 is a deficient number, since it is larger than the sum of its proper divisors (20797030096).

20891837504 is a wasteful number, since it uses less digits than its factorization.

20891837504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823850 (or 1823840 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 20891837504 in words is "twenty billion, eight hundred ninety-one million, eight hundred thirty-seven thousand, five hundred four".