20724130664 has 32 divisors (see below), whose sum is σ = 40136083200. Its totient is φ = 10021589760.

The previous prime is 20724130639. The next prime is 20724130709. The reversal of 20724130664 is 46603142702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388352 + ... + 438480.

It is an arithmetic number, because the mean of its divisors is an integer number (1254252600).

Almost surely, 2^20724130664 is an apocalyptic number.

It is an amenable number.

20724130664 is a deficient number, since it is larger than the sum of its proper divisors (19411952536).

20724130664 is a wasteful number, since it uses less digits than its factorization.

20724130664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51833 (or 51829 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 20724130664 in words is "twenty billion, seven hundred twenty-four million, one hundred thirty thousand, six hundred sixty-four".