20505134 has 8 divisors (see below), whose sum is σ = 33123720. Its totient is φ = 9463896.

The previous prime is 20505127. The next prime is 20505151. The reversal of 20505134 is 43150502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394304 + ... + 394355.

It is an arithmetic number, because the mean of its divisors is an integer number (4140465).

Almost surely, 2^20505134 is an apocalyptic number.

20505134 is a deficient number, since it is larger than the sum of its proper divisors (12618586).

20505134 is a wasteful number, since it uses less digits than its factorization.

20505134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788674.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20505134 is about 4528.2594890311. The cubic root of 20505134 is about 273.7080289830.

Adding to 20505134 its reverse (43150502), we get a palindrome (63655636).

The spelling of 20505134 in words is "twenty million, five hundred five thousand, one hundred thirty-four".