20663026506 has 32 divisors (see below), whose sum is σ = 45922627200. Its totient is φ = 6886956960.

The previous prime is 20663026477. The next prime is 20663026519. The reversal of 20663026506 is 60562036602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 851550 + ... + 875478.

It is an arithmetic number, because the mean of its divisors is an integer number (1435082100).

Almost surely, 2^20663026506 is an apocalyptic number.

20663026506 is an abundant number, since it is smaller than the sum of its proper divisors (25259600694).

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

20663026506 is a wasteful number, since it uses less digits than its factorization.

20663026506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39931 (or 39925 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 20663026506 in words is "twenty billion, six hundred sixty-three million, twenty-six thousand, five hundred six".