20015173 has 2 divisors, whose sum is σ = 20015174. Its totient is φ = 20015172.

The previous prime is 20015147. The next prime is 20015179. The reversal of 20015173 is 37151002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18809569 + 1205604 = 4337^2 + 1098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20015173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20015173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20015179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10007586 + 10007587.

It is an arithmetic number, because the mean of its divisors is an integer number (10007587).

Almost surely, 2^20015173 is an apocalyptic number.

It is an amenable number.

20015173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20015173 is an equidigital number, since it uses as much as digits as its factorization.

20015173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20015173 is about 4473.8320263506. The cubic root of 20015173 is about 271.5103874056.

Adding to 20015173 its reverse (37151002), we get a palindrome (57166175).

The spelling of 20015173 in words is "twenty million, fifteen thousand, one hundred seventy-three".