20520173 has 8 divisors (see below), whose sum is σ = 21990528. Its totient is φ = 19079104.

The previous prime is 20520167. The next prime is 20520179. The reversal of 20520173 is 37102502.

It is an interprime number because it is at equal distance from previous prime (20520167) and next prime (20520179).

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 20520173 - 2¹² = 20516077 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 (20520179) 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, 5861 + ... + 8682.

It is an arithmetic number, because the mean of its divisors is an integer number (2748816).

Almost surely, 2^20520173 is an apocalyptic number.

It is an amenable number.

20520173 is a deficient number, since it is larger than the sum of its proper divisors (1470355).

20520173 is a wasteful number, since it uses less digits than its factorization.

20520173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14643.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20520173 is about 4529.9197564637. The cubic root of 20520173 is about 273.7749274994.

Adding to 20520173 its reverse (37102502), we get a palindrome (57622675).

The spelling of 20520173 in words is "twenty million, five hundred twenty thousand, one hundred seventy-three".