20761749 has 12 divisors (see below), whose sum is σ = 30412512. Its totient is φ = 13645800.

The previous prime is 20761747. The next prime is 20761757. The reversal of 20761749 is 94716702.

It is a happy number.

It is not a de Polignac number, because 20761749 - 2¹ = 20761747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20761747) 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 11 ways as a sum of consecutive naturals, for example, 15607 + ... + 16884.

It is an arithmetic number, because the mean of its divisors is an integer number (2534376).

Almost surely, 2^20761749 is an apocalyptic number.

It is an amenable number.

20761749 is a deficient number, since it is larger than the sum of its proper divisors (9650763).

20761749 is a wasteful number, since it uses less digits than its factorization.

20761749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32568 (or 32565 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20761749 is about 4556.5062273632. The cubic root of 20761749 is about 274.8450874069.

The spelling of 20761749 in words is "twenty million, seven hundred sixty-one thousand, seven hundred forty-nine".