20709709700 has 36 divisors (see below), whose sum is σ = 44950599540. Its totient is φ = 8281943040.

The previous prime is 20709709673. The next prime is 20709709739. The reversal of 20709709700 is 790790702.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 663680644 + 20046029056 = 25762^2 + 141584^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 451004 + ... + 494796.

It is an arithmetic number, because the mean of its divisors is an integer number (1248627765).

Almost surely, 2^20709709700 is an apocalyptic number.

20709709700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20709709700 is an abundant number, since it is smaller than the sum of its proper divisors (24240889840).

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

20709709700 is a wasteful number, since it uses less digits than its factorization.

20709709700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48536 (or 48529 counting only the distinct ones).

The product of its (nonzero) digits is 55566, while the sum is 41.

The spelling of 20709709700 in words is "twenty billion, seven hundred nine million, seven hundred nine thousand, seven hundred".