20709748940 has 24 divisors (see below), whose sum is σ = 44311050000. Its totient is φ = 8127599168.

The previous prime is 20709748937. The next prime is 20709748949. The reversal of 20709748940 is 4984790702.

It is a super-2 number, since 2×20709748940² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20709748949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9767690 + ... + 9769809.

It is an arithmetic number, because the mean of its divisors is an integer number (1846293750).

Almost surely, 2^20709748940 is an apocalyptic number.

20709748940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20709748940 is an abundant number, since it is smaller than the sum of its proper divisors (23601301060).

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

20709748940 is a wasteful number, since it uses less digits than its factorization.

20709748940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19537561 (or 19537559 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 20709748940 in words is "twenty billion, seven hundred nine million, seven hundred forty-eight thousand, nine hundred forty".