20644664588748 has 72 divisors (see below), whose sum is σ = 54273957890880. Its totient is φ = 6610812848640.

The previous prime is 20644664588689. The next prime is 20644664588753. The reversal of 20644664588748 is 84788546644602.

20644664588748 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 466 + 45 + 8 + 87 + 48 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97989693 + ... + 98200148.

Almost surely, 2^{20644664588748} is an apocalyptic number.

It is an amenable number.

20644664588748 is an abundant number, since it is smaller than the sum of its proper divisors (33629293302132).

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

20644664588748 is a wasteful number, since it uses less digits than its factorization.

20644664588748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196189967 (or 196189962 counting only the distinct ones).

The product of its (nonzero) digits is 1981808640, while the sum is 72.

The spelling of 20644664588748 in words is "twenty trillion, six hundred forty-four billion, six hundred sixty-four million, five hundred eighty-eight thousand, seven hundred forty-eight".