20689660000 has 240 divisors, whose sum is σ = 53129793024. Its totient is φ = 7921152000.

The previous prime is 20689659983. The next prime is 20689660009. The reversal of 20689660000 is 6698602.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689660009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54019809 + ... + 54020191.

Almost surely, 2^20689660000 is an apocalyptic number.

20689660000 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 20689660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26564896512).

20689660000 is an abundant number, since it is smaller than the sum of its proper divisors (32440133024).

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

20689660000 is an equidigital number, since it uses as much as digits as its factorization.

20689660000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 20689660000 in words is "twenty billion, six hundred eighty-nine million, six hundred sixty thousand".