20157771 has 8 divisors (see below), whose sum is σ = 26902224. Its totient is φ = 13425920.

The previous prime is 20157751. The next prime is 20157779. The reversal of 20157771 is 17775102.

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 20157771 - 2⁶ = 20157707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20157779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1615 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (3362778).

Almost surely, 2^20157771 is an apocalyptic number.

20157771 is a deficient number, since it is larger than the sum of its proper divisors (6744453).

20157771 is a wasteful number, since it uses less digits than its factorization.

20157771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6301.

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

The square root of 20157771 is about 4489.7406383888. The cubic root of 20157771 is about 272.1536536326.

The spelling of 20157771 in words is "twenty million, one hundred fifty-seven thousand, seven hundred seventy-one".