20269789 has 6 divisors (see below), whose sum is σ = 21393150. Its totient is φ = 19202616.

The previous prime is 20269771. The next prime is 20269793. The reversal of 20269789 is 98796202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19096900 + 1172889 = 4370^2 + 1083^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20269789 is a prime.

It is a super-2 number, since 2×20269789² = 821728692209042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20269189) 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, 27714 + ... + 28435.

It is an arithmetic number, because the mean of its divisors is an integer number (3565525).

Almost surely, 2^20269789 is an apocalyptic number.

It is an amenable number.

20269789 is a deficient number, since it is larger than the sum of its proper divisors (1123361).

20269789 is an equidigital number, since it uses as much as digits as its factorization.

20269789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56187 (or 56168 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 20269789 is about 4502.1982408597. The cubic root of 20269789 is about 272.6568476713.

The spelling of 20269789 in words is "twenty million, two hundred sixty-nine thousand, seven hundred eighty-nine".