20805522 has 16 divisors (see below), whose sum is σ = 41670720. Its totient is φ = 6925232.

The previous prime is 20805517. The next prime is 20805529. The reversal of 20805522 is 22550802.

It is a junction number, because it is equal to n+sod(n) for n = 20805492 and 20805501.

It is not an unprimeable number, because it can be changed into a prime (20805529) 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, 2968 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (2604420).

Almost surely, 2^20805522 is an apocalyptic number.

20805522 is an abundant number, since it is smaller than the sum of its proper divisors (20865198).

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

20805522 is a wasteful number, since it uses less digits than its factorization.

20805522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 20805522 is about 4561.3070495199. The cubic root of 20805522 is about 275.0381082175.

The spelling of 20805522 in words is "twenty million, eight hundred five thousand, five hundred twenty-two".