20755563 has 4 divisors (see below), whose sum is σ = 27674088. Its totient is φ = 13837040.

The previous prime is 20755547. The next prime is 20755571. The reversal of 20755563 is 36555702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20755563 - 2⁴ = 20755547 is a prime.

It is a super-4 number, since 4×20755563⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (20755573) 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, 3459258 + ... + 3459263.

It is an arithmetic number, because the mean of its divisors is an integer number (6918522).

Almost surely, 2^20755563 is an apocalyptic number.

20755563 is a deficient number, since it is larger than the sum of its proper divisors (6918525).

20755563 is an equidigital number, since it uses as much as digits as its factorization.

20755563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918524.

The product of its (nonzero) digits is 31500, while the sum is 33.

The square root of 20755563 is about 4555.8273672298. The cubic root of 20755563 is about 274.8177878347.

The spelling of 20755563 in words is "twenty million, seven hundred fifty-five thousand, five hundred sixty-three".