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20663655537 = 371633960223
BaseRepresentation
bin10011001111101001…
…100101110001110001
31222100002022110111110
4103033221211301301
5314304343434122
613254233503533
71331031113460
oct231751456161
958302273443
1020663655537
118844105278
124008271ba9
131c44030315
1410004bc9d7
1580e15e90c
hex4cfa65c71

20663655537 has 16 divisors (see below), whose sum is σ = 31489925120. Its totient is φ = 11806884432.

The previous prime is 20663655497. The next prime is 20663655539. The reversal of 20663655537 is 73555636602.

It is not a de Polignac number, because 20663655537 - 28 = 20663655281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20663655539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313008 + ... + 373230.

It is an arithmetic number, because the mean of its divisors is an integer number (1968120320).

Almost surely, 220663655537 is an apocalyptic number.

It is an amenable number.

20663655537 is a deficient number, since it is larger than the sum of its proper divisors (10826269583).

20663655537 is a wasteful number, since it uses less digits than its factorization.

20663655537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76572.

The product of its (nonzero) digits is 3402000, while the sum is 48.

The spelling of 20663655537 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred thirty-seven".

Divisors: 1 3 7 21 16339 49017 60223 114373 180669 343119 421561 1264683 983983597 2951950791 6887885179 20663655537