20570655 has 32 divisors (see below), whose sum is σ = 37785600. Its totient is φ = 9361152.

The previous prime is 20570653. The next prime is 20570677. The reversal of 20570655 is 55607502.

It is not a de Polignac number, because 20570655 - 2¹ = 20570653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20570653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42706 + ... + 43184.

It is an arithmetic number, because the mean of its divisors is an integer number (1180800).

Almost surely, 2^20570655 is an apocalyptic number.

20570655 is a deficient number, since it is larger than the sum of its proper divisors (17214945).

20570655 is a wasteful number, since it uses less digits than its factorization.

20570655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 20570655 is about 4535.4883970748. The cubic root of 20570655 is about 273.9992496472. Note that the first 3 decimals are identical.

It can be divided in two parts, 205706 and 55, that added together give a triangular number (205761 = T₆₄₁).

The spelling of 20570655 in words is "twenty million, five hundred seventy thousand, six hundred fifty-five".