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20308533 = 371974909
BaseRepresentation
bin100110101111…
…0001000110101
31102012210001220
41031132020311
520144333113
62003140553
7334422360
oct115361065
942183056
1020308533
1110511113
126974759
1342909ab
1429a90d7
151bb2523
hex135e235

20308533 has 16 divisors (see below), whose sum is σ = 31109760. Its totient is φ = 11543616.

The previous prime is 20308529. The next prime is 20308543. The reversal of 20308533 is 33580302.

It is not a de Polignac number, because 20308533 - 22 = 20308529 is a prime.

It is a super-2 number, since 2×203085332 = 824873025224178, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20308543) 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 15 ways as a sum of consecutive naturals, for example, 1683 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (1944360).

Almost surely, 220308533 is an apocalyptic number.

It is an amenable number.

20308533 is a deficient number, since it is larger than the sum of its proper divisors (10801227).

20308533 is a wasteful number, since it uses less digits than its factorization.

20308533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5116.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20308533 is about 4506.4989737045. The cubic root of 20308533 is about 272.8304573296.

Adding to 20308533 its reverse (33580302), we get a palindrome (53888835).

The spelling of 20308533 in words is "twenty million, three hundred eight thousand, five hundred thirty-three".

Divisors: 1 3 7 21 197 591 1379 4137 4909 14727 34363 103089 967073 2901219 6769511 20308533