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20840675769 = 32481212
BaseRepresentation
bin10011011010001100…
…110111100110111001
31222210102102000121100
4103122030313212321
5320140203111034
613324000002013
71335310551444
oct233214674671
958712360540
1020840675769
118925022191
124057600309
131c718ccb14
141019bdc65b
1581e97a099
hex4da3379b9

20840675769 has 9 divisors (see below), whose sum is σ = 30103823919. Its totient is φ = 13893495120.

The previous prime is 20840675761. The next prime is 20840675771. The reversal of 20840675769 is 96757604802.

The square root of 20840675769 is 144363.

It is a perfect power (a square), and thus also a powerful number.

20840675769 is a `hidden beast` number, since 2 + 0 + 8 + 4 + 0 + 67 + 576 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15070754169 + 5769921600 = 122763^2 + 75960^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 20840675769 - 23 = 20840675761 is a prime.

It is a super-2 number, since 2×208406757692 (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20840675761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 409029 + ... + 457149.

Almost surely, 220840675769 is an apocalyptic number.

20840675769 is the 144363-rd square number.

20840675769 is the 72182-nd centered octagonal number.

It is an amenable number.

20840675769 is a deficient number, since it is larger than the sum of its proper divisors (9263148150).

20840675769 is an frugal number, since it uses more digits than its factorization.

20840675769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96248 (or 48124 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 20840675769 in words is "twenty billion, eight hundred forty million, six hundred seventy-five thousand, seven hundred sixty-nine".

Divisors: 1 3 9 48121 144363 433089 2315630641 6946891923 20840675769