20755289 has 4 divisors (see below), whose sum is σ = 20797056. Its totient is φ = 20713524.

The previous prime is 20755211. The next prime is 20755297. The reversal of 20755289 is 98255702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98255702 = 2 ⋅49127851.

It is a cyclic number.

It is not a de Polignac number, because 20755289 - 2¹² = 20751193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20755789) 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, 20129 + ... + 21134.

It is an arithmetic number, because the mean of its divisors is an integer number (5199264).

Almost surely, 2^20755289 is an apocalyptic number.

It is an amenable number.

20755289 is a deficient number, since it is larger than the sum of its proper divisors (41767).

20755289 is an equidigital number, since it uses as much as digits as its factorization.

20755289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41766.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 20755289 is about 4555.7972957541. The cubic root of 20755289 is about 274.8165785139.

The spelling of 20755289 in words is "twenty million, seven hundred fifty-five thousand, two hundred eighty-nine".