20047739 has 2 divisors, whose sum is σ = 20047740. Its totient is φ = 20047738.

The previous prime is 20047733. The next prime is 20047757. The reversal of 20047739 is 93774002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20047739 - 2²⁴ = 3270523 is a prime.

It is not a weakly prime, because it can be changed into another prime (20047733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023869 + 10023870.

It is an arithmetic number, because the mean of its divisors is an integer number (10023870).

Almost surely, 2^20047739 is an apocalyptic number.

20047739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20047739 is an equidigital number, since it uses as much as digits as its factorization.

20047739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20047739 is about 4477.4701562378. The cubic root of 20047739 is about 271.6575626860.

The spelling of 20047739 in words is "twenty million, forty-seven thousand, seven hundred thirty-nine".