20492569 has 2 divisors, whose sum is σ = 20492570. Its totient is φ = 20492568.

The previous prime is 20492567. The next prime is 20492603. The reversal of 20492569 is 96529402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14538969 + 5953600 = 3813^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20492569 - 2¹ = 20492567 is a prime.

It is a super-2 number, since 2×20492569² = 839890768439522, which contains 22 as substring.

Together with 20492567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20492567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10246284 + 10246285.

It is an arithmetic number, because the mean of its divisors is an integer number (10246285).

Almost surely, 2^20492569 is an apocalyptic number.

It is an amenable number.

20492569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20492569 is an equidigital number, since it uses as much as digits as its factorization.

20492569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 20492569 is about 4526.8718780191. The cubic root of 20492569 is about 273.6521105629.

The spelling of 20492569 in words is "twenty million, four hundred ninety-two thousand, five hundred sixty-nine".