20761967500 has 60 divisors (see below), whose sum is σ = 45843637840. Its totient is φ = 8224056000.

The previous prime is 20761967461. The next prime is 20761967507. The reversal of 20761967500 is 576916702.

It is not an unprimeable number, because it can be changed into a prime (20761967507) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 217186 + ... + 297814.

Almost surely, 2^20761967500 is an apocalyptic number.

20761967500 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 20761967500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22921818920).

20761967500 is an abundant number, since it is smaller than the sum of its proper divisors (25081670340).

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

20761967500 is a wasteful number, since it uses less digits than its factorization.

20761967500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80756 (or 80739 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 20761967500 in words is "twenty billion, seven hundred sixty-one million, nine hundred sixty-seven thousand, five hundred".