20342505 has 8 divisors (see below), whose sum is σ = 32548032. Its totient is φ = 10849328.

The previous prime is 20342503. The next prime is 20342527. The reversal of 20342505 is 50524302.

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 20342505 - 2¹ = 20342503 is a prime.

It is a super-3 number, since 3×20342505³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20342501) 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, 678069 + ... + 678098.

It is an arithmetic number, because the mean of its divisors is an integer number (4068504).

Almost surely, 2^20342505 is an apocalyptic number.

It is an amenable number.

20342505 is a deficient number, since it is larger than the sum of its proper divisors (12205527).

20342505 is a wasteful number, since it uses less digits than its factorization.

20342505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356175.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20342505 is about 4510.2666218307. The cubic root of 20342505 is about 272.9825023336.

Adding to 20342505 its reverse (50524302), we get a palindrome (70866807).

The spelling of 20342505 in words is "twenty million, three hundred forty-two thousand, five hundred five".