20713507 has 4 divisors (see below), whose sum is σ = 20726440. Its totient is φ = 20700576.

The previous prime is 20713489. The next prime is 20713529. The reversal of 20713507 is 70531702.

20713507 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70531702 = 2 ⋅35265851.

It is a cyclic number.

It is not a de Polignac number, because 20713507 - 2¹¹ = 20711459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20713577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3657 + ... + 7402.

It is an arithmetic number, because the mean of its divisors is an integer number (5181610).

Almost surely, 2^20713507 is an apocalyptic number.

20713507 is a deficient number, since it is larger than the sum of its proper divisors (12933).

20713507 is a wasteful number, since it uses less digits than its factorization.

20713507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12932.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 20713507 is about 4551.2093997090. The cubic root of 20713507 is about 274.6320456318.

The spelling of 20713507 in words is "twenty million, seven hundred thirteen thousand, five hundred seven".