20641894000 has 160 divisors (see below), whose sum is σ = 61430818176. Its totient is φ = 6532761600.

The previous prime is 20641893929. The next prime is 20641894043. The reversal of 20641894000 is 49814602.

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 31 ways as a sum of consecutive naturals, for example, 125292 + ... + 238708.

Almost surely, 2^20641894000 is an apocalyptic number.

20641894000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20641894000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30715409088).

20641894000 is an abundant number, since it is smaller than the sum of its proper divisors (40788924176).

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

20641894000 is a wasteful number, since it uses less digits than its factorization.

20641894000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113460 (or 113444 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 20641894000 in words is "twenty billion, six hundred forty-one million, eight hundred ninety-four thousand".