20655646615 has 8 divisors (see below), whose sum is σ = 24809501808. Its totient is φ = 16509366720.

The previous prime is 20655646579. The next prime is 20655646657. The reversal of 20655646615 is 51664655602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20655646615 - 2¹¹ = 20655644567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1887822 + ... + 1898731.

It is an arithmetic number, because the mean of its divisors is an integer number (3101187726).

Almost surely, 2^20655646615 is an apocalyptic number.

20655646615 is a deficient number, since it is larger than the sum of its proper divisors (4153855193).

20655646615 is a wasteful number, since it uses less digits than its factorization.

20655646615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787649.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 20655646615 in words is "twenty billion, six hundred fifty-five million, six hundred forty-six thousand, six hundred fifteen".