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20556733 = 231078353
BaseRepresentation
bin100111001101…
…0101110111101
31102200101112111
41032122232331
520230303413
62012334021
7336505111
oct116325675
942611474
1020556733
111067063a
126a74311
134349962
142a31741
151c10d3d
hex139abbd

20556733 has 8 divisors (see below), whose sum is σ = 21653568. Its totient is φ = 19476864.

The previous prime is 20556707. The next prime is 20556743. The reversal of 20556733 is 33765502.

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-20556733 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20556695 and 20556704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556743) 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, 1716 + ... + 6637.

It is an arithmetic number, because the mean of its divisors is an integer number (2706696).

Almost surely, 220556733 is an apocalyptic number.

20556733 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20556733 is the 2424-th centered heptagonal number.

It is an amenable number.

20556733 is a deficient number, since it is larger than the sum of its proper divisors (1096835).

20556733 is a wasteful number, since it uses less digits than its factorization.

20556733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8483.

The product of its (nonzero) digits is 18900, while the sum is 31.

The square root of 20556733 is about 4533.9533522082. The cubic root of 20556733 is about 273.9374224401.

The spelling of 20556733 in words is "twenty million, five hundred fifty-six thousand, seven hundred thirty-three".

Divisors: 1 23 107 2461 8353 192119 893771 20556733