20747105 has 8 divisors (see below), whose sum is σ = 24921000. Its totient is φ = 16581376.

The previous prime is 20747087. The next prime is 20747131. The reversal of 20747105 is 50174702.

It can be written as a sum of positive squares in 4 ways, for example, as 2531281 + 18215824 = 1591^2 + 4268^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20747105 is a prime.

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, 8681 + ... + 10809.

It is an arithmetic number, because the mean of its divisors is an integer number (3115125).

Almost surely, 2^20747105 is an apocalyptic number.

It is an amenable number.

20747105 is a deficient number, since it is larger than the sum of its proper divisors (4173895).

20747105 is a wasteful number, since it uses less digits than its factorization.

20747105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4083.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20747105 is about 4554.8990109551. The cubic root of 20747105 is about 274.7804528697.

The spelling of 20747105 in words is "twenty million, seven hundred forty-seven thousand, one hundred five".