20439307 has 16 divisors (see below), whose sum is σ = 24733440. Its totient is φ = 16499808.

The previous prime is 20439299. The next prime is 20439317. The reversal of 20439307 is 70393402.

It is a cyclic number.

It is not a de Polignac number, because 20439307 - 2³ = 20439299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20439317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29853 + ... + 30529.

It is an arithmetic number, because the mean of its divisors is an integer number (1545840).

Almost surely, 2^20439307 is an apocalyptic number.

20439307 is a deficient number, since it is larger than the sum of its proper divisors (4294133).

20439307 is a wasteful number, since it uses less digits than its factorization.

20439307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20439307 is about 4520.9851802456. The cubic root of 20439307 is about 273.4148228508.

The spelling of 20439307 in words is "twenty million, four hundred thirty-nine thousand, three hundred seven".