20800739 has 2 divisors, whose sum is σ = 20800740. Its totient is φ = 20800738.

The previous prime is 20800733. The next prime is 20800807. The reversal of 20800739 is 93700802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20800739 - 2⁴ = 20800723 is a prime.

It is a super-2 number, since 2×20800739² = 865341485892242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20800733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10400369 + 10400370.

It is an arithmetic number, because the mean of its divisors is an integer number (10400370).

Almost surely, 2^20800739 is an apocalyptic number.

20800739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20800739 is an equidigital number, since it uses as much as digits as its factorization.

20800739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20800739 is about 4560.7827179115. The cubic root of 20800739 is about 275.0170303503.

The spelling of 20800739 in words is "twenty million, eight hundred thousand, seven hundred thirty-nine".