20385071 has 8 divisors (see below), whose sum is σ = 23511840. Its totient is φ = 17311968.

The previous prime is 20385067. The next prime is 20385083. The reversal of 20385071 is 17058302.

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 20385071 - 2² = 20385067 is a prime.

It is a super-2 number, since 2×20385071² = 831102239350082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20385071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20385371) 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, 12596 + ... + 14121.

It is an arithmetic number, because the mean of its divisors is an integer number (2938980).

Almost surely, 2^20385071 is an apocalyptic number.

20385071 is a deficient number, since it is larger than the sum of its proper divisors (3126769).

20385071 is a wasteful number, since it uses less digits than its factorization.

20385071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26833.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20385071 is about 4514.9829457042. The cubic root of 20385071 is about 273.1727718856.

The spelling of 20385071 in words is "twenty million, three hundred eighty-five thousand, seventy-one".