20240399 has 2 divisors, whose sum is σ = 20240400. Its totient is φ = 20240398.

The previous prime is 20240383. The next prime is 20240411. The reversal of 20240399 is 99304202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20240399 - 2⁴ = 20240383 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20245399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10120199 + 10120200.

It is an arithmetic number, because the mean of its divisors is an integer number (10120200).

Almost surely, 2^20240399 is an apocalyptic number.

20240399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20240399 is an equidigital number, since it uses as much as digits as its factorization.

20240399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20240399 is about 4498.9330957461. The cubic root of 20240399 is about 272.5250051402.

The spelling of 20240399 in words is "twenty million, two hundred forty thousand, three hundred ninety-nine".