20566019 has 2 divisors, whose sum is σ = 20566020. Its totient is φ = 20566018.

The previous prime is 20566001. The next prime is 20566057. The reversal of 20566019 is 91066502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20566019 - 2¹² = 20561923 is a prime.

It is a super-2 number, since 2×20566019² = 845922275016722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20565982 and 20566000.

It is not a weakly prime, because it can be changed into another prime (20566069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10283009 + 10283010.

It is an arithmetic number, because the mean of its divisors is an integer number (10283010).

Almost surely, 2^20566019 is an apocalyptic number.

20566019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20566019 is an equidigital number, since it uses as much as digits as its factorization.

20566019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 20566019 is about 4534.9772877050. The cubic root of 20566019 is about 273.9786644015.

The spelling of 20566019 in words is "twenty million, five hundred sixty-six thousand, nineteen".