20505522 has 24 divisors (see below), whose sum is σ = 43287696. Its totient is φ = 6474744.

The previous prime is 20505497. The next prime is 20505571. The reversal of 20505522 is 22550502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2568 + ... + 6899.

It is an arithmetic number, because the mean of its divisors is an integer number (1803654).

Almost surely, 2^20505522 is an apocalyptic number.

20505522 is an abundant number, since it is smaller than the sum of its proper divisors (22782174).

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

20505522 is a wasteful number, since it uses less digits than its factorization.

20505522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9510 (or 9491 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20505522 is about 4528.3023308962. The cubic root of 20505522 is about 273.7097553482.

The spelling of 20505522 in words is "twenty million, five hundred five thousand, five hundred twenty-two".