20570778 has 12 divisors (see below), whose sum is σ = 44570058. Its totient is φ = 6856920.

The previous prime is 20570761. The next prime is 20570783. The reversal of 20570778 is 87707502.

It can be written as a sum of positive squares in only one way, i.e., 19474569 + 1096209 = 4413^2 + 1047^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 571393 + ... + 571428.

Almost surely, 2^20570778 is an apocalyptic number.

20570778 is an abundant number, since it is smaller than the sum of its proper divisors (23999280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20570778 is a wasteful number, since it uses less digits than its factorization.

20570778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142829 (or 1142826 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 20570778 is about 4535.5019567849. The cubic root of 20570778 is about 273.9997957624. Note that the first 3 decimals are identical.

The spelling of 20570778 in words is "twenty million, five hundred seventy thousand, seven hundred seventy-eight".