20786147 has 8 divisors (see below), whose sum is σ = 21216000. Its totient is φ = 20359944.

The previous prime is 20786137. The next prime is 20786149. The reversal of 20786147 is 74168702.

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 20786147 - 2⁴ = 20786131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20786149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12554 + ... + 14112.

It is an arithmetic number, because the mean of its divisors is an integer number (2652000).

Almost surely, 2^20786147 is an apocalyptic number.

20786147 is a deficient number, since it is larger than the sum of its proper divisors (429853).

20786147 is a wasteful number, since it uses less digits than its factorization.

20786147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20786147 is about 4559.1827118465. The cubic root of 20786147 is about 274.9527059165.

The spelling of 20786147 in words is "twenty million, seven hundred eighty-six thousand, one hundred forty-seven".