20771157 has 8 divisors (see below), whose sum is σ = 30212640. Its totient is φ = 12588560.

The previous prime is 20771141. The next prime is 20771159. The reversal of 20771157 is 75117702.

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 20771157 - 2⁴ = 20771141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20771159) 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, 314682 + ... + 314747.

It is an arithmetic number, because the mean of its divisors is an integer number (3776580).

Almost surely, 2^20771157 is an apocalyptic number.

It is an amenable number.

20771157 is a deficient number, since it is larger than the sum of its proper divisors (9441483).

20771157 is a wasteful number, since it uses less digits than its factorization.

20771157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629443.

The product of its (nonzero) digits is 3430, while the sum is 30.

The square root of 20771157 is about 4557.5384803642. The cubic root of 20771157 is about 274.8865956651.

Adding to 20771157 its reverse (75117702), we get a palindrome (95888859).

It can be divided in two parts, 20 and 771157, that added together give a palindrome (771177).

The spelling of 20771157 in words is "twenty million, seven hundred seventy-one thousand, one hundred fifty-seven".