20392499 has 2 divisors, whose sum is σ = 20392500. Its totient is φ = 20392498.

The previous prime is 20392459. The next prime is 20392523. The reversal of 20392499 is 99429302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20392499 - 2⁸ = 20392243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20392429) 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 as a sum of consecutive naturals, namely, 10196249 + 10196250.

It is an arithmetic number, because the mean of its divisors is an integer number (10196250).

Almost surely, 2^20392499 is an apocalyptic number.

20392499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20392499 is an equidigital number, since it uses as much as digits as its factorization.

20392499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 20392499 is about 4515.8054652520. The cubic root of 20392499 is about 273.2059478135.

The spelling of 20392499 in words is "twenty million, three hundred ninety-two thousand, four hundred ninety-nine".