20555522 has 16 divisors (see below), whose sum is σ = 33303480. Its totient is φ = 9459072.

The previous prime is 20555503. The next prime is 20555527. The reversal of 20555522 is 22555502.

It can be written as a sum of positive squares in 4 ways, for example, as 19280881 + 1274641 = 4391^2 + 1129^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 20555491 and 20555500.

It is not an unprimeable number, because it can be changed into a prime (20555527) 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 7 ways as a sum of consecutive naturals, for example, 9668 + ... + 11600.

Almost surely, 2^20555522 is an apocalyptic number.

20555522 is a deficient number, since it is larger than the sum of its proper divisors (12747958).

20555522 is a wasteful number, since it uses less digits than its factorization.

20555522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357.

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 20555522 is about 4533.8198023300. The cubic root of 20555522 is about 273.9320431039.

The spelling of 20555522 in words is "twenty million, five hundred fifty-five thousand, five hundred twenty-two".