20157773 has 4 divisors (see below), whose sum is σ = 20649468. Its totient is φ = 19666080.

The previous prime is 20157751. The next prime is 20157779. The reversal of 20157773 is 37775102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37775102 = 2 ⋅18887551.

It can be written as a sum of positive squares in 2 ways, for example, as 426409 + 19731364 = 653^2 + 4442^2 .

It is a cyclic number.

It is not a de Polignac number, because 20157773 - 2⁸ = 20157517 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 245786 + ... + 245867.

It is an arithmetic number, because the mean of its divisors is an integer number (5162367).

Almost surely, 2^20157773 is an apocalyptic number.

It is an amenable number.

20157773 is a deficient number, since it is larger than the sum of its proper divisors (491695).

20157773 is an equidigital number, since it uses as much as digits as its factorization.

20157773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491694.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 20157773 is about 4489.7408611188. The cubic root of 20157773 is about 272.1536626334.

The spelling of 20157773 in words is "twenty million, one hundred fifty-seven thousand, seven hundred seventy-three".