20742177 has 4 divisors (see below), whose sum is σ = 27656240. Its totient is φ = 13828116.

The previous prime is 20742151. The next prime is 20742179. The reversal of 20742177 is 77124702.

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 not a de Polignac number, because 20742177 - 2¹⁰ = 20741153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20742179) 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, 3457027 + ... + 3457032.

It is an arithmetic number, because the mean of its divisors is an integer number (6914060).

Almost surely, 2^20742177 is an apocalyptic number.

It is an amenable number.

20742177 is a deficient number, since it is larger than the sum of its proper divisors (6914063).

20742177 is an equidigital number, since it uses as much as digits as its factorization.

20742177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6914062.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 20742177 is about 4554.3580228173. The cubic root of 20742177 is about 274.7586952108.

Adding to 20742177 its reverse (77124702), we get a palindrome (97866879).

The spelling of 20742177 in words is "twenty million, seven hundred forty-two thousand, one hundred seventy-seven".