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21820016 = 241363751
BaseRepresentation
bin101001100111…
…1001001110000
31112001120102202
41103033021300
521041220031
62055402332
7353316131
oct123171160
945046382
1021820016
1111353779
1273833a8
13469c96a
142c7dc88
151db02cb
hex14cf270

21820016 has 10 divisors (see below), whose sum is σ = 42276312. Its totient is φ = 10910000.

The previous prime is 21820013. The next prime is 21820033. The reversal of 21820016 is 61002812.

It is a super-2 number, since 2×218200162 = 952226196480512, 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 21820016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21820013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681860 + ... + 681891.

Almost surely, 221820016 is an apocalyptic number.

It is an amenable number.

21820016 is a deficient number, since it is larger than the sum of its proper divisors (20456296).

21820016 is a wasteful number, since it uses less digits than its factorization.

21820016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363759 (or 1363753 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21820016 is about 4671.1899982767. The cubic root of 21820016 is about 279.4377151352.

Adding to 21820016 its reverse (61002812), we get a palindrome (82822828).

The spelling of 21820016 in words is "twenty-one million, eight hundred twenty thousand, sixteen".

Divisors: 1 2 4 8 16 1363751 2727502 5455004 10910008 21820016