20570690 has 24 divisors (see below), whose sum is σ = 43073532. Its totient is φ = 7052640.

The previous prime is 20570689. The next prime is 20570707. The reversal of 20570690 is 9607502.

It can be written as a sum of positive squares in 2 ways, for example, as 17581249 + 2989441 = 4193^2 + 1729^2 .

It is a super-2 number, since 2×20570690² = 846306574152200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20501 + ... + 21480.

Almost surely, 2^20570690 is an apocalyptic number.

20570690 is an abundant number, since it is smaller than the sum of its proper divisors (22502842).

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

20570690 is a wasteful number, since it uses less digits than its factorization.

20570690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42002 (or 41995 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20570690 is about 4535.4922555330. The cubic root of 20570690 is about 273.9994050460. Note that the first 3 decimals are identical.

The spelling of 20570690 in words is "twenty million, five hundred seventy thousand, six hundred ninety".