20711734816 has 12 divisors (see below), whose sum is σ = 40776227982. Its totient is φ = 10355867392.

The previous prime is 20711734811. The next prime is 20711734819. The reversal of 20711734816 is 61843711702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17317507216 + 3394227600 = 131596^2 + 58260^2 .

It is not an unprimeable number, because it can be changed into a prime (20711734811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323620825 + ... + 323620888.

Almost surely, 2^20711734816 is an apocalyptic number.

It is an amenable number.

20711734816 is a deficient number, since it is larger than the sum of its proper divisors (20064493166).

20711734816 is an equidigital number, since it uses as much as digits as its factorization.

20711734816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647241723 (or 647241715 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 20711734816 in words is "twenty billion, seven hundred eleven million, seven hundred thirty-four thousand, eight hundred sixteen".