20947055 has 8 divisors (see below), whose sum is σ = 25166400. Its totient is φ = 16737696.

The previous prime is 20947033. The next prime is 20947061. The reversal of 20947055 is 55074902.

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 20947055 - 2⁸ = 20946799 is a prime.

It is a super-2 number, since 2×20947055² = 877558226346050, which contains 22 as substring.

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, 3386 + ... + 7304.

It is an arithmetic number, because the mean of its divisors is an integer number (3145800).

Almost surely, 2^20947055 is an apocalyptic number.

20947055 is a deficient number, since it is larger than the sum of its proper divisors (4219345).

20947055 is a wasteful number, since it uses less digits than its factorization.

20947055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20947055 is about 4576.7952761731. The cubic root of 20947055 is about 275.6603633991.

The spelling of 20947055 in words is "twenty million, nine hundred forty-seven thousand, fifty-five".