20819189601 has 12 divisors (see below), whose sum is σ = 34368186112. Its totient is φ = 11896679736.

The previous prime is 20819189597. The next prime is 20819189627. The reversal of 20819189601 is 10698191802.

20819189601 is a `hidden beast` number, since 20 + 8 + 1 + 9 + 18 + 9 + 601 = 666.

It is not a de Polignac number, because 20819189601 - 2² = 20819189597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20819189641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165231601 + ... + 165231726.

Almost surely, 2^20819189601 is an apocalyptic number.

20819189601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20819189601 is a deficient number, since it is larger than the sum of its proper divisors (13548996511).

20819189601 is a wasteful number, since it uses less digits than its factorization.

20819189601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330463340 (or 330463337 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

It can be divided in two parts, 208191 and 89601, that added together give a palindrome (297792).

The spelling of 20819189601 in words is "twenty billion, eight hundred nineteen million, one hundred eighty-nine thousand, six hundred one".