20345039 has 16 divisors (see below), whose sum is σ = 25310880. Its totient is φ = 16066560.

The previous prime is 20345033. The next prime is 20345051. The reversal of 20345039 is 93054302.

It is a cyclic number.

It is not a de Polignac number, because 20345039 - 2⁴ = 20345023 is a prime.

It is a super-2 number, since 2×20345039² = 827841223823042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20344999 and 20345017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1754 + ... + 6615.

It is an arithmetic number, because the mean of its divisors is an integer number (1581930).

Almost surely, 2^20345039 is an apocalyptic number.

20345039 is a deficient number, since it is larger than the sum of its proper divisors (4965841).

20345039 is a wasteful number, since it uses less digits than its factorization.

20345039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20345039 is about 4510.5475277398. The cubic root of 20345039 is about 272.9938367118.

The spelling of 20345039 in words is "twenty million, three hundred forty-five thousand, thirty-nine".