20439007 has 2 divisors, whose sum is σ = 20439008. Its totient is φ = 20439006.

The previous prime is 20438989. The next prime is 20439017. The reversal of 20439007 is 70093402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20439007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20439017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219503 + 10219504.

It is an arithmetic number, because the mean of its divisors is an integer number (10219504).

Almost surely, 2^20439007 is an apocalyptic number.

20439007 is a deficient number, since it is larger than the sum of its proper divisors (1).

20439007 is an equidigital number, since it uses as much as digits as its factorization.

20439007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20439007 is about 4520.9520015147. The cubic root of 20439007 is about 273.4134851530.

The spelling of 20439007 in words is "twenty million, four hundred thirty-nine thousand, seven".