20245399 has 2 divisors, whose sum is σ = 20245400. Its totient is φ = 20245398.

The previous prime is 20245369. The next prime is 20245411. The reversal of 20245399 is 99354202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20245399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20245339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122699 + 10122700.

It is an arithmetic number, because the mean of its divisors is an integer number (10122700).

Almost surely, 2^20245399 is an apocalyptic number.

20245399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20245399 is an equidigital number, since it uses as much as digits as its factorization.

20245399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20245399 is about 4499.4887487358. The cubic root of 20245399 is about 272.5474439739.

The spelling of 20245399 in words is "twenty million, two hundred forty-five thousand, three hundred ninety-nine".