20245739 has 2 divisors, whose sum is σ = 20245740. Its totient is φ = 20245738.

The previous prime is 20245711. The next prime is 20245751. The reversal of 20245739 is 93754202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20245739 - 2⁸ = 20245483 is a prime.

It is a super-2 number, since 2×20245739² = 819779895312242, which contains 22 as substring.

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, 10122869 + 10122870.

It is an arithmetic number, because the mean of its divisors is an integer number (10122870).

Almost surely, 2^20245739 is an apocalyptic number.

20245739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20245739 is an equidigital number, since it uses as much as digits as its factorization.

20245739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20245739 is about 4499.5265306474. The cubic root of 20245739 is about 272.5489696804.

The spelling of 20245739 in words is "twenty million, two hundred forty-five thousand, seven hundred thirty-nine".