20755761 has 8 divisors (see below), whose sum is σ = 29803200. Its totient is φ = 12772752.

The previous prime is 20755751. The next prime is 20755781. The reversal of 20755761 is 16755702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20755761 - 2¹⁰ = 20754737 is a prime.

It is a super-2 number, since 2×20755761² = 861603229378242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20755711) 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 7 ways as a sum of consecutive naturals, for example, 266061 + ... + 266138.

It is an arithmetic number, because the mean of its divisors is an integer number (3725400).

Almost surely, 2^20755761 is an apocalyptic number.

It is an amenable number.

20755761 is a deficient number, since it is larger than the sum of its proper divisors (9047439).

20755761 is a wasteful number, since it uses less digits than its factorization.

20755761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532215.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 20755761 is about 4555.8490975887. The cubic root of 20755761 is about 274.8186617169.

The spelling of 20755761 in words is "twenty million, seven hundred fifty-five thousand, seven hundred sixty-one".