20386147 has 4 divisors (see below), whose sum is σ = 20504160. Its totient is φ = 20268136.

The previous prime is 20386133. The next prime is 20386153. The reversal of 20386147 is 74168302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20386147 - 2⁷ = 20386019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20386117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58747 + ... + 59092.

It is an arithmetic number, because the mean of its divisors is an integer number (5126040).

Almost surely, 2^20386147 is an apocalyptic number.

20386147 is a deficient number, since it is larger than the sum of its proper divisors (118013).

20386147 is a wasteful number, since it uses less digits than its factorization.

20386147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118012.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20386147 is about 4515.1021029430. The cubic root of 20386147 is about 273.1775781600.

The spelling of 20386147 in words is "twenty million, three hundred eighty-six thousand, one hundred forty-seven".