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20157 = 36719
BaseRepresentation
bin100111010111101
31000122120
410322331
51121112
6233153
7112524
oct47275
930576
1020157
1114165
12b7b9
139237
1474bb
155e8c
hex4ebd

20157 has 4 divisors (see below), whose sum is σ = 26880. Its totient is φ = 13436.

The previous prime is 20149. The next prime is 20161. The reversal of 20157 is 75102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20157 - 23 = 20149 is a prime.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20107) 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, 3357 + ... + 3362.

It is an arithmetic number, because the mean of its divisors is an integer number (6720).

220157 is an apocalyptic number.

It is an amenable number.

20157 is a deficient number, since it is larger than the sum of its proper divisors (6723).

20157 is an equidigital number, since it uses as much as digits as its factorization.

20157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722.

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 20157 is about 141.9753499732. The cubic root of 20157 is about 27.2150183786.

Adding to 20157 its reverse (75102), we get a palindrome (95259).

Subtracting 20157 from its reverse (75102), we obtain a palindrome (54945).

The spelling of 20157 in words is "twenty thousand, one hundred fifty-seven".

Divisors: 1 3 6719 20157