20570156 has 6 divisors (see below), whose sum is σ = 35997780. Its totient is φ = 10285076.

The previous prime is 20570117. The next prime is 20570167. The reversal of 20570156 is 65107502.

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 as a sum of consecutive naturals, namely, 2571266 + ... + 2571273.

It is an arithmetic number, because the mean of its divisors is an integer number (5999630).

Almost surely, 2^20570156 is an apocalyptic number.

It is an amenable number.

20570156 is a deficient number, since it is larger than the sum of its proper divisors (15427624).

20570156 is a wasteful number, since it uses less digits than its factorization.

20570156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5142543 (or 5142541 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 20570156 is about 4535.4333861275. The cubic root of 20570156 is about 273.9970340844.

Adding to 20570156 its reverse (65107502), we get a palindrome (85677658).

The spelling of 20570156 in words is "twenty million, five hundred seventy thousand, one hundred fifty-six".