20445802636 has 24 divisors (see below), whose sum is σ = 41142483200. Its totient is φ = 8708727312.

The previous prime is 20445802613. The next prime is 20445802667. The reversal of 20445802636 is 63620854402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2235336 + ... + 2244463.

Almost surely, 2^20445802636 is an apocalyptic number.

It is an amenable number.

20445802636 is an abundant number, since it is smaller than the sum of its proper divisors (20696680564).

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

20445802636 is a wasteful number, since it uses less digits than its factorization.

20445802636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479973 (or 4479971 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 20445802636 in words is "twenty billion, four hundred forty-five million, eight hundred two thousand, six hundred thirty-six".