20255769 has 6 divisors (see below), whose sum is σ = 29258346. Its totient is φ = 13503840.

The previous prime is 20255743. The next prime is 20255771. The reversal of 20255769 is 96755202.

It can be written as a sum of positive squares in only one way, i.e., 13046544 + 7209225 = 3612^2 + 2685^2 .

It is not a de Polignac number, because 20255769 - 2⁸ = 20255513 is a prime.

It is a super-2 number, since 2×20255769² = 820592355562722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20251769) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1125312 + ... + 1125329.

It is an arithmetic number, because the mean of its divisors is an integer number (4876391).

Almost surely, 2^20255769 is an apocalyptic number.

It is an amenable number.

20255769 is a deficient number, since it is larger than the sum of its proper divisors (9002577).

20255769 is a wasteful number, since it uses less digits than its factorization.

20255769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250647 (or 2250644 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 20255769 is about 4500.6409543531. The cubic root of 20255769 is about 272.5939703405.

The spelling of 20255769 in words is "twenty million, two hundred fifty-five thousand, seven hundred sixty-nine".