20709719576 has 64 divisors (see below), whose sum is σ = 47838900480. Its totient is φ = 8184758400.

The previous prime is 20709719573. The next prime is 20709719581. The reversal of 20709719576 is 67591790702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20709719573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 751595 + ... + 778661.

It is an arithmetic number, because the mean of its divisors is an integer number (747482820).

Almost surely, 2^20709719576 is an apocalyptic number.

20709719576 is a gapful number since it is divisible by the number (26) 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 20709719576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23919450240).

20709719576 is an abundant number, since it is smaller than the sum of its proper divisors (27129180904).

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

20709719576 is a wasteful number, since it uses less digits than its factorization.

20709719576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28144 (or 28140 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 53.

The spelling of 20709719576 in words is "twenty billion, seven hundred nine million, seven hundred nineteen thousand, five hundred seventy-six".