20770 has 16 divisors (see below), whose sum is σ = 39168. Its totient is φ = 7920.

The previous prime is 20759. The next prime is 20771. The reversal of 20770 is 7702.

20770 = T₂₀ + T₂₁ + ... + T₅₀.

It is not an unprimeable number, because it can be changed into a prime (20771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277 + ... + 343.

It is an arithmetic number, because the mean of its divisors is an integer number (2448).

2²⁰⁷⁷⁰ is an apocalyptic number.

20770 is a deficient number, since it is larger than the sum of its proper divisors (18398).

20770 is a wasteful number, since it uses less digits than its factorization.

20770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105.

The product of its (nonzero) digits is 98, while the sum is 16.

The square root of 20770 is about 144.1180072024. The cubic root of 20770 is about 27.4881491637.

It can be divided in two parts, 20 and 770, that multiplied together give a triangular number (15400 = T₁₇₅).

The spelling of 20770 in words is "twenty thousand, seven hundred seventy", and thus it is an iban number.