20552818 has 48 divisors (see below), whose sum is σ = 37537920. Its totient is φ = 8379360.

The previous prime is 20552809. The next prime is 20552821. The reversal of 20552818 is 81825502.

It is a super-2 number, since 2×20552818² = 844836655482248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20552818.

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 23 ways as a sum of consecutive naturals, for example, 147793 + ... + 147931.

It is an arithmetic number, because the mean of its divisors is an integer number (782040).

Almost surely, 2^20552818 is an apocalyptic number.

20552818 is a deficient number, since it is larger than the sum of its proper divisors (16985102).

20552818 is a wasteful number, since it uses less digits than its factorization.

20552818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 20552818 is about 4533.5215892284. The cubic root of 20552818 is about 273.9200310076.

The spelling of 20552818 in words is "twenty million, five hundred fifty-two thousand, eight hundred eighteen".