20064139 has 2 divisors, whose sum is σ = 20064140. Its totient is φ = 20064138.

The previous prime is 20064137. The next prime is 20064169. The reversal of 20064139 is 93146002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20064139 - 2¹ = 20064137 is a prime.

It is a super-2 number, since 2×20064139² = 805139347622642, which contains 22 as substring.

Together with 20064137, it forms a pair of twin primes.

It is equal to p_1274434 and since 20064139 and 1274434 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20064137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10032069 + 10032070.

It is an arithmetic number, because the mean of its divisors is an integer number (10032070).

Almost surely, 2^20064139 is an apocalyptic number.

20064139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20064139 is an equidigital number, since it uses as much as digits as its factorization.

20064139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20064139 is about 4479.3011731742. The cubic root of 20064139 is about 271.7316187467.

The spelling of 20064139 in words is "twenty million, sixty-four thousand, one hundred thirty-nine".