20770289 has 2 divisors, whose sum is σ = 20770290. Its totient is φ = 20770288.

The previous prime is 20770271. The next prime is 20770303. The reversal of 20770289 is 98207702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 339889 = 4520^2 + 583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20770289 is a prime.

It is a super-4 number, since 4×20770289⁴ (a number of 30 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (20770229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10385144 + 10385145.

It is an arithmetic number, because the mean of its divisors is an integer number (10385145).

Almost surely, 2^20770289 is an apocalyptic number.

It is an amenable number.

20770289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20770289 is an equidigital number, since it uses as much as digits as its factorization.

20770289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 20770289 is about 4557.4432525266. The cubic root of 20770289 is about 274.8827665590.

The spelling of 20770289 in words is "twenty million, seven hundred seventy thousand, two hundred eighty-nine".