20651510000 has 200 divisors, whose sum is σ = 54879170544. Its totient is φ = 7463680000.

The previous prime is 20651509993. The next prime is 20651510023. The reversal of 20651510000 is 1515602.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (20).

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 39 ways as a sum of consecutive naturals, for example, 21669524 + ... + 21670476.

Almost surely, 2^20651510000 is an apocalyptic number.

20651510000 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 20651510000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27439585272).

20651510000 is an abundant number, since it is smaller than the sum of its proper divisors (34227660544).

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

20651510000 is a wasteful number, since it uses less digits than its factorization.

20651510000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The spelling of 20651510000 in words is "twenty billion, six hundred fifty-one million, five hundred ten thousand".