20573869 has 2 divisors, whose sum is σ = 20573870. Its totient is φ = 20573868.

The previous prime is 20573867. The next prime is 20573879. The reversal of 20573869 is 96837502.

20573869 = T₃₇₀₂ + T₃₇₀₃ + T₃₇₀₄.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 1755625 = 4338^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 20573869 - 2¹ = 20573867 is a prime.

It is a super-2 number, since 2×20573869² = 846568171258322, which contains 22 as substring.

Together with 20573867, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20573867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10286934 + 10286935.

It is an arithmetic number, because the mean of its divisors is an integer number (10286935).

Almost surely, 2^20573869 is an apocalyptic number.

20573869 is the 3704-th centered triangular number.

It is an amenable number.

20573869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20573869 is an equidigital number, since it uses as much as digits as its factorization.

20573869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20573869 is about 4535.8427000944. The cubic root of 20573869 is about 274.0135189664.

The spelling of 20573869 in words is "twenty million, five hundred seventy-three thousand, eight hundred sixty-nine".