20029839 has 12 divisors (see below), whose sum is σ = 27453384. Its totient is φ = 12989664.

The previous prime is 20029831. The next prime is 20029847. The reversal of 20029839 is 93892002.

It is an interprime number because it is at equal distance from previous prime (20029831) and next prime (20029847).

It is not a de Polignac number, because 20029839 - 2³ = 20029831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20029831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1669 + ... + 6545.

It is an arithmetic number, because the mean of its divisors is an integer number (2287782).

Almost surely, 2^20029839 is an apocalyptic number.

20029839 is a deficient number, since it is larger than the sum of its proper divisors (7423545).

20029839 is an equidigital number, since it uses as much as digits as its factorization.

20029839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4954 (or 4917 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20029839 is about 4475.4708132218. The cubic root of 20029839 is about 271.5766870932.

Adding to 20029839 its product of nonzero digits (7776), we get a triangular number (20037615 = T₆₃₃₀).

The spelling of 20029839 in words is "twenty million, twenty-nine thousand, eight hundred thirty-nine".