20705337 has 12 divisors (see below), whose sum is σ = 31667220. Its totient is φ = 12991488.

The previous prime is 20705323. The next prime is 20705357. The reversal of 20705337 is 73350702.

It can be written as a sum of positive squares in 2 ways, for example, as 12702096 + 8003241 = 3564^2 + 2829^2 .

It is not a de Polignac number, because 20705337 - 2⁶ = 20705273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20705337.

It is not an unprimeable number, because it can be changed into a prime (20705357) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67512 + ... + 67817.

It is an arithmetic number, because the mean of its divisors is an integer number (2638935).

Almost surely, 2^20705337 is an apocalyptic number.

It is an amenable number.

20705337 is a deficient number, since it is larger than the sum of its proper divisors (10961883).

20705337 is a wasteful number, since it uses less digits than its factorization.

20705337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135352 (or 135349 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 27.

The square root of 20705337 is about 4550.3117475619. The cubic root of 20705337 is about 274.5959333038.

The spelling of 20705337 in words is "twenty million, seven hundred five thousand, three hundred thirty-seven".