20606889601 has 3 divisors (see below), whose sum is σ = 20607033153. Its totient is φ = 20606746050.

The previous prime is 20606889581. The next prime is 20606889649. The reversal of 20606889601 is 10698860602.

The square root of 20606889601 is 143551.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10698860602 = 2 ⋅5349430301.

It is not a de Polignac number, because 20606889601 - 2¹⁹ = 20606365313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606889001) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 71776 + ... + 215326.

It is an arithmetic number, because the mean of its divisors is an integer number (6869011051).

Almost surely, 2^20606889601 is an apocalyptic number.

20606889601 is the 143551-st square number.

20606889601 is the 71776-th centered octagonal number.

It is an amenable number.

20606889601 is a deficient number, since it is larger than the sum of its proper divisors (143552).

20606889601 is an frugal number, since it uses more digits than its factorization.

20606889601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287102 (or 143551 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 20606889601 in words is "twenty billion, six hundred six million, eight hundred eighty-nine thousand, six hundred one".