20709980000 has 60 divisors (see below), whose sum is σ = 50949706500. Its totient is φ = 8283984000.

The previous prime is 20709979987. The next prime is 20709980003. The reversal of 20709980000 is 8990702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20709980003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 497750 + ... + 537749.

It is an arithmetic number, because the mean of its divisors is an integer number (849161775).

Almost surely, 2^20709980000 is an apocalyptic number.

20709980000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20709980000 is an abundant number, since it is smaller than the sum of its proper divisors (30239726500).

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

20709980000 is an equidigital number, since it uses as much as digits as its factorization.

20709980000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035529 (or 1035506 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 20709980000 in words is "twenty billion, seven hundred nine million, nine hundred eighty thousand".