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20774661 = 36924887
BaseRepresentation
bin100111100111…
…1111100000101
31110002110110220
41033033330011
520304242121
62021134553
7341403345
oct117177405
943073426
1020774661
11107aa346
126b5a459
1343c4bcb
142a8ad25
151c556c6
hex13cff05

20774661 has 4 divisors (see below), whose sum is σ = 27699552. Its totient is φ = 13849772.

The previous prime is 20774653. The next prime is 20774683. The reversal of 20774661 is 16647702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20774661 - 23 = 20774653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20774161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3462441 + ... + 3462446.

It is an arithmetic number, because the mean of its divisors is an integer number (6924888).

Almost surely, 220774661 is an apocalyptic number.

It is an amenable number.

20774661 is a deficient number, since it is larger than the sum of its proper divisors (6924891).

20774661 is an equidigital number, since it uses as much as digits as its factorization.

20774661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924890.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 20774661 is about 4557.9228821910. The cubic root of 20774661 is about 274.9020521700.

The spelling of 20774661 in words is "twenty million, seven hundred seventy-four thousand, six hundred sixty-one".

Divisors: 1 3 6924887 20774661