20713005 has 12 divisors (see below), whose sum is σ = 35902620. Its totient is φ = 11046912.

The previous prime is 20713003. The next prime is 20713019. The reversal of 20713005 is 50031702.

It can be written as a sum of positive squares in 2 ways, for example, as 4888521 + 15824484 = 2211^2 + 3978^2 .

It is not a de Polignac number, because 20713005 - 2¹ = 20713003 is a prime.

It is a super-2 number, since 2×20713005² = 858057152260050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20713003) 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, 230100 + ... + 230189.

It is an arithmetic number, because the mean of its divisors is an integer number (2991885).

Almost surely, 2^20713005 is an apocalyptic number.

It is an amenable number.

20713005 is a deficient number, since it is larger than the sum of its proper divisors (15189615).

20713005 is a wasteful number, since it uses less digits than its factorization.

20713005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460300 (or 460297 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20713005 is about 4551.1542491988. The cubic root of 20713005 is about 274.6298270087.

Adding to 20713005 its reverse (50031702), we get a palindrome (70744707).

The spelling of 20713005 in words is "twenty million, seven hundred thirteen thousand, five".