20072771 has 2 divisors, whose sum is σ = 20072772. Its totient is φ = 20072770.

The previous prime is 20072761. The next prime is 20072777. The reversal of 20072771 is 17727002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20072771 - 2⁶ = 20072707 is a prime.

It is a super-2 number, since 2×20072771² = 805832271236882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20072771.

It is not a weakly prime, because it can be changed into another prime (20072777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10036385 + 10036386.

It is an arithmetic number, because the mean of its divisors is an integer number (10036386).

Almost surely, 2^20072771 is an apocalyptic number.

20072771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20072771 is an equidigital number, since it uses as much as digits as its factorization.

20072771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 20072771 is about 4480.2646127210. The cubic root of 20072771 is about 271.7705813131.

Adding to 20072771 its reverse (17727002), we get a palindrome (37799773).

The spelling of 20072771 in words is "twenty million, seventy-two thousand, seven hundred seventy-one".