20703309 has 16 divisors (see below), whose sum is σ = 30411264. Its totient is φ = 12423600.

The previous prime is 20703307. The next prime is 20703317. The reversal of 20703309 is 90330702.

It is not a de Polignac number, because 20703309 - 2¹ = 20703307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20703301) 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, 354 + ... + 6444.

It is an arithmetic number, because the mean of its divisors is an integer number (1900704).

Almost surely, 2^20703309 is an apocalyptic number.

It is an amenable number.

20703309 is a deficient number, since it is larger than the sum of its proper divisors (9707955).

20703309 is a wasteful number, since it uses less digits than its factorization.

20703309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6208.

The product of its (nonzero) digits is 1134, while the sum is 24.

The square root of 20703309 is about 4550.0889002304. The cubic root of 20703309 is about 274.5869678419.

It can be divided in two parts, 20703 and 309, that added together give a palindrome (21012).

The spelling of 20703309 in words is "twenty million, seven hundred three thousand, three hundred nine".