20015873 has 4 divisors (see below), whose sum is σ = 21069360. Its totient is φ = 18962388.

The previous prime is 20015839. The next prime is 20015893. The reversal of 20015873 is 37851002.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20015873 is a prime.

It is a Duffinian number.

20015873 is a modest number, since divided by 15873 gives 20 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20015893) 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, 526715 + ... + 526752.

It is an arithmetic number, because the mean of its divisors is an integer number (5267340).

Almost surely, 2^20015873 is an apocalyptic number.

It is an amenable number.

20015873 is a deficient number, since it is larger than the sum of its proper divisors (1053487).

20015873 is a wasteful number, since it uses less digits than its factorization.

20015873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053486.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20015873 is about 4473.9102583758. The cubic root of 20015873 is about 271.5135525886.

Adding to 20015873 its reverse (37851002), we get a palindrome (57866875).

The spelling of 20015873 in words is "twenty million, fifteen thousand, eight hundred seventy-three".