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18522020 = 2251184191
BaseRepresentation
bin100011010100…
…1111110100100
31021212000102202
41012221332210
514220201040
61500554032
7313302026
oct106517644
937760382
1018522020
11a500960
126252918
133ab679a
142662016
15195d015
hex11a9fa4

18522020 has 24 divisors (see below), whose sum is σ = 42432768. Its totient is φ = 6735200.

The previous prime is 18522019. The next prime is 18522029. The reversal of 18522020 is 2022581.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 18521983 and 18522001.

It is not an unprimeable number, because it can be changed into a prime (18522029) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41876 + ... + 42315.

It is an arithmetic number, because the mean of its divisors is an integer number (1768032).

Almost surely, 218522020 is an apocalyptic number.

18522020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18522020 is an abundant number, since it is smaller than the sum of its proper divisors (23910748).

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

18522020 is a wasteful number, since it uses less digits than its factorization.

18522020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84211 (or 84209 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 18522020 is about 4303.7216452740. The cubic root of 18522020 is about 264.5835157100.

The spelling of 18522020 in words is "eighteen million, five hundred twenty-two thousand, twenty".

Divisors: 1 2 4 5 10 11 20 22 44 55 110 220 84191 168382 336764 420955 841910 926101 1683820 1852202 3704404 4630505 9261010 18522020