20755655 has 4 divisors (see below), whose sum is σ = 24906792. Its totient is φ = 16604520.

The previous prime is 20755649. The next prime is 20755661. The reversal of 20755655 is 55655702.

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

It is an interprime number because it is at equal distance from previous prime (20755649) and next prime (20755661).

It is a de Polignac number, because none of the positive numbers 2^k-20755655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2075561 + ... + 2075570.

It is an arithmetic number, because the mean of its divisors is an integer number (6226698).

Almost surely, 2^20755655 is an apocalyptic number.

20755655 is a deficient number, since it is larger than the sum of its proper divisors (4151137).

20755655 is an equidigital number, since it uses as much as digits as its factorization.

20755655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4151136.

The product of its (nonzero) digits is 52500, while the sum is 35.

The square root of 20755655 is about 4555.8374641771. The cubic root of 20755655 is about 274.8181938817.

The spelling of 20755655 in words is "twenty million, seven hundred fifty-five thousand, six hundred fifty-five".