20557371 has 8 divisors (see below), whose sum is σ = 28294144. Its totient is φ = 13262760.

The previous prime is 20557351. The next prime is 20557387. The reversal of 20557371 is 17375502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20557371 - 2¹¹ = 20555323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20557351) 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, 110431 + ... + 110616.

It is an arithmetic number, because the mean of its divisors is an integer number (3536768).

Almost surely, 2^20557371 is an apocalyptic number.

20557371 is a deficient number, since it is larger than the sum of its proper divisors (7736773).

20557371 is a wasteful number, since it uses less digits than its factorization.

20557371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221081.

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 20557371 is about 4534.0237096866. The cubic root of 20557371 is about 273.9402563902.

The spelling of 20557371 in words is "twenty million, five hundred fifty-seven thousand, three hundred seventy-one".