20002739 has 2 divisors, whose sum is σ = 20002740. Its totient is φ = 20002738.

The previous prime is 20002733. The next prime is 20002757. The reversal of 20002739 is 93720002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002739 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20002733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001369 + 10001370.

It is an arithmetic number, because the mean of its divisors is an integer number (10001370).

Almost surely, 2^20002739 is an apocalyptic number.

20002739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002739 is an equidigital number, since it uses as much as digits as its factorization.

20002739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 20002739 is about 4472.4421740253. The cubic root of 20002739 is about 271.4541524103.

The spelling of 20002739 in words is "twenty million, two thousand, seven hundred thirty-nine".