20992655 has 8 divisors (see below), whose sum is σ = 25215792. Its totient is φ = 16777728.

The previous prime is 20992649. The next prime is 20992669. The reversal of 20992655 is 55629902.

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

It is a cyclic number.

It is not a de Polignac number, because 20992655 - 2⁴ = 20992639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8879 + ... + 10991.

It is an arithmetic number, because the mean of its divisors is an integer number (3151974).

Almost surely, 2^20992655 is an apocalyptic number.

20992655 is a deficient number, since it is larger than the sum of its proper divisors (4223137).

20992655 is a wasteful number, since it uses less digits than its factorization.

20992655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 20992655 is about 4581.7742196664. The cubic root of 20992655 is about 275.8602483348.

The spelling of 20992655 in words is "twenty million, nine hundred ninety-two thousand, six hundred fifty-five".