20713345 has 4 divisors (see below), whose sum is σ = 24856020. Its totient is φ = 16570672.

The previous prime is 20713321. The next prime is 20713369. The reversal of 20713345 is 54331702.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20713321) and next prime (20713369).

It can be written as a sum of positive squares in 2 ways, for example, as 16257024 + 4456321 = 4032^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 20713345 - 2¹¹ = 20711297 is a prime.

It is a super-2 number, since 2×20713345² = 858085322178050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2071330 + ... + 2071339.

It is an arithmetic number, because the mean of its divisors is an integer number (6214005).

Almost surely, 2^20713345 is an apocalyptic number.

It is an amenable number.

20713345 is a deficient number, since it is larger than the sum of its proper divisors (4142675).

20713345 is an equidigital number, since it uses as much as digits as its factorization.

20713345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4142674.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20713345 is about 4551.1916022071. The cubic root of 20713345 is about 274.6313296657.

The spelling of 20713345 in words is "twenty million, seven hundred thirteen thousand, three hundred forty-five".