20667891500 has 48 divisors (see below), whose sum is σ = 45645949440. Its totient is φ = 8174249600.

The previous prime is 20667891479. The next prime is 20667891527. The reversal of 20667891500 is 519876602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187724 + ... + 276723.

It is an arithmetic number, because the mean of its divisors is an integer number (950957280).

Almost surely, 2^20667891500 is an apocalyptic number.

20667891500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20667891500 is an abundant number, since it is smaller than the sum of its proper divisors (24978057940).

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

20667891500 is a wasteful number, since it uses less digits than its factorization.

20667891500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464555 (or 464543 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 20667891500 in words is "twenty billion, six hundred sixty-seven million, eight hundred ninety-one thousand, five hundred".