20439299 has 2 divisors, whose sum is σ = 20439300. Its totient is φ = 20439298.

The previous prime is 20439283. The next prime is 20439317. The reversal of 20439299 is 99293402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20439299 - 2⁴ = 20439283 is a prime.

It is a super-2 number, since 2×20439299² = 835529887222802, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20439599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219649 + 10219650.

It is an arithmetic number, because the mean of its divisors is an integer number (10219650).

Almost surely, 2^20439299 is an apocalyptic number.

20439299 is a deficient number, since it is larger than the sum of its proper divisors (1).

20439299 is an equidigital number, since it uses as much as digits as its factorization.

20439299 is an evil number, because the sum of its binary digits is even.

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

The square root of 20439299 is about 4520.9842954826. The cubic root of 20439299 is about 273.4147871790.

The spelling of 20439299 in words is "twenty million, four hundred thirty-nine thousand, two hundred ninety-nine".