20505712 has 20 divisors (see below), whose sum is σ = 41821480. Its totient is φ = 9713088.

The previous prime is 20505707. The next prime is 20505713. The reversal of 20505712 is 21750502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33423 + ... + 34030.

It is an arithmetic number, because the mean of its divisors is an integer number (2091074).

Almost surely, 2^20505712 is an apocalyptic number.

It is an amenable number.

20505712 is an abundant number, since it is smaller than the sum of its proper divisors (21315768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20505712 is a wasteful number, since it uses less digits than its factorization.

20505712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67480 (or 67474 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 20505712 is about 4528.3233100122. The cubic root of 20505712 is about 273.7106007252.

The spelling of 20505712 in words is "twenty million, five hundred five thousand, seven hundred twelve".