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20605033 = 231098219
BaseRepresentation
bin100111010011…
…0100001101001
31102202211210101
41032212201221
520233330113
62013345401
7340065661
oct116464151
942684711
1020605033
11106a3959
126a98261
134365937
142a451a1
151c202dd
hex13a6869

20605033 has 8 divisors (see below), whose sum is σ = 21700800. Its totient is φ = 19525968.

The previous prime is 20605021. The next prime is 20605043. The reversal of 20605033 is 33050602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20605033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20605033.

It is not an unprimeable number, because it can be changed into a prime (20605043) 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, 1603 + ... + 6616.

It is an arithmetic number, because the mean of its divisors is an integer number (2712600).

Almost surely, 220605033 is an apocalyptic number.

20605033 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20605033 is a deficient number, since it is larger than the sum of its proper divisors (1095767).

20605033 is a wasteful number, since it uses less digits than its factorization.

20605033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8351.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 20605033 is about 4539.2767044982. The cubic root of 20605033 is about 274.1518019716.

Adding to 20605033 its reverse (33050602), we get a palindrome (53655635).

The spelling of 20605033 in words is "twenty million, six hundred five thousand, thirty-three".

Divisors: 1 23 109 2507 8219 189037 895871 20605033