20570056 has 32 divisors (see below), whose sum is σ = 42053760. Its totient is φ = 9375552.

The previous prime is 20570041. The next prime is 20570057. The reversal of 20570056 is 65007502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20570056.

It is not an unprimeable number, because it can be changed into a prime (20570057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7441 + ... + 9823.

It is an arithmetic number, because the mean of its divisors is an integer number (1314180).

Almost surely, 2^20570056 is an apocalyptic number.

20570056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20570056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21026880).

20570056 is an abundant number, since it is smaller than the sum of its proper divisors (21483704).

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

20570056 is a wasteful number, since it uses less digits than its factorization.

20570056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2485 (or 2481 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20570056 is about 4535.4223618093. The cubic root of 20570056 is about 273.9965900796.

Adding to 20570056 its reverse (65007502), we get a palindrome (85577558).

The spelling of 20570056 in words is "twenty million, five hundred seventy thousand, fifty-six".