20385157 has 8 divisors (see below), whose sum is σ = 23108960. Its totient is φ = 17826480.

The previous prime is 20385143. The next prime is 20385179. The reversal of 20385157 is 75158302.

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-20385157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20385257) 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, 41019 + ... + 41512.

It is an arithmetic number, because the mean of its divisors is an integer number (2888620).

Almost surely, 2^20385157 is an apocalyptic number.

It is an amenable number.

20385157 is a deficient number, since it is larger than the sum of its proper divisors (2723803).

20385157 is a wasteful number, since it uses less digits than its factorization.

20385157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82563.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 20385157 is about 4514.9924695397. The cubic root of 20385157 is about 273.1731560364.

The spelling of 20385157 in words is "twenty million, three hundred eighty-five thousand, one hundred fifty-seven".