20747659808 has 18 divisors (see below), whose sum is σ = 40848559479. Its totient is φ = 10373422496.

The previous prime is 20747659783. The next prime is 20747659859. The reversal of 20747659808 is 80895674702.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 10373829904 + 10373829904 = 101852^2 + 101852^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101852.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 802085 + ... + 827547.

Almost surely, 2^20747659808 is an apocalyptic number.

It is an amenable number.

20747659808 is a deficient number, since it is larger than the sum of its proper divisors (20100899671).

20747659808 is an frugal number, since it uses more digits than its factorization.

20747659808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50936 (or 25465 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 20747659808 in words is "twenty billion, seven hundred forty-seven million, six hundred fifty-nine thousand, eight hundred eight".