20713237 has 8 divisors (see below), whose sum is σ = 21064320. Its totient is φ = 20364960.

The previous prime is 20713219. The next prime is 20713243. The reversal of 20713237 is 73231702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20713237 - 2⁷ = 20713109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20713207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18228 + ... + 19330.

It is an arithmetic number, because the mean of its divisors is an integer number (2633040).

Almost surely, 2^20713237 is an apocalyptic number.

It is an amenable number.

20713237 is a deficient number, since it is larger than the sum of its proper divisors (351083).

20713237 is a wasteful number, since it uses less digits than its factorization.

20713237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 20713237 is about 4551.1797371671. The cubic root of 20713237 is about 274.6308523529.

Adding to 20713237 its reverse (73231702), we get a palindrome (93944939).

The spelling of 20713237 in words is "twenty million, seven hundred thirteen thousand, two hundred thirty-seven".