20799655 has 8 divisors (see below), whose sum is σ = 25128000. Its totient is φ = 16527456.

The previous prime is 20799631. The next prime is 20799689. The reversal of 20799655 is 55699702.

It is a happy number.

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 20799655 - 2¹⁵ = 20766887 is a prime.

It is a congruent number.

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, 13215 + ... + 14704.

It is an arithmetic number, because the mean of its divisors is an integer number (3141000).

Almost surely, 2^20799655 is an apocalyptic number.

20799655 is a deficient number, since it is larger than the sum of its proper divisors (4328345).

20799655 is a wasteful number, since it uses less digits than its factorization.

20799655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28073.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 20799655 is about 4560.6638771126. The cubic root of 20799655 is about 275.0122528976.

The spelling of 20799655 in words is "twenty million, seven hundred ninety-nine thousand, six hundred fifty-five".