20290771 has 4 divisors (see below), whose sum is σ = 20945344. Its totient is φ = 19636200.

The previous prime is 20290769. The next prime is 20290789. The reversal of 20290771 is 17709202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20290771 - 2¹ = 20290769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20290471) 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, 327240 + ... + 327301.

It is an arithmetic number, because the mean of its divisors is an integer number (5236336).

Almost surely, 2^20290771 is an apocalyptic number.

20290771 is a deficient number, since it is larger than the sum of its proper divisors (654573).

20290771 is an equidigital number, since it uses as much as digits as its factorization.

20290771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654572.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20290771 is about 4504.5278331918. The cubic root of 20290771 is about 272.7508942537.

Adding to 20290771 its reverse (17709202), we get a palindrome (37999973).

The spelling of 20290771 in words is "twenty million, two hundred ninety thousand, seven hundred seventy-one".