20520269 has 18 divisors (see below), whose sum is σ = 26245422. Its totient is φ = 15985200.

The previous prime is 20520263. The next prime is 20520277. The reversal of 20520269 is 96202502.

It can be written as a sum of positive squares in only one way, i.e., 14822500 + 5697769 = 3850^2 + 2387^2 .

It is not a de Polignac number, because 20520269 - 2¹² = 20516173 is a prime.

It is a super-2 number, since 2×20520269² = 842162879664722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4199 + ... + 7659.

It is an arithmetic number, because the mean of its divisors is an integer number (1458079).

Almost surely, 2^20520269 is an apocalyptic number.

It is an amenable number.

20520269 is a deficient number, since it is larger than the sum of its proper divisors (5725153).

20520269 is a wasteful number, since it uses less digits than its factorization.

20520269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497 (or 3479 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20520269 is about 4529.9303526655. The cubic root of 20520269 is about 273.7753544346.

The spelling of 20520269 in words is "twenty million, five hundred twenty thousand, two hundred sixty-nine".