20715073 has 4 divisors (see below), whose sum is σ = 21805360. Its totient is φ = 19624788.

The previous prime is 20715067. The next prime is 20715091. The reversal of 20715073 is 37051702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37051702 = 2 ⋅18525851.

It is a cyclic number.

It is not a de Polignac number, because 20715073 - 2⁵ = 20715041 is a prime.

It is a super-3 number, since 3×20715073³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20715043) 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, 545115 + ... + 545152.

It is an arithmetic number, because the mean of its divisors is an integer number (5451340).

Almost surely, 2^20715073 is an apocalyptic number.

It is an amenable number.

20715073 is a deficient number, since it is larger than the sum of its proper divisors (1090287).

20715073 is a wasteful number, since it uses less digits than its factorization.

20715073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090286.

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

The square root of 20715073 is about 4551.3814386404. The cubic root of 20715073 is about 274.6389664452.

Adding to 20715073 its reverse (37051702), we get a palindrome (57766775).

The spelling of 20715073 in words is "twenty million, seven hundred fifteen thousand, seventy-three".