20570144 has 48 divisors (see below), whose sum is σ = 46702656. Its totient is φ = 8736000.

The previous prime is 20570117. The next prime is 20570167. The reversal of 20570144 is 44107502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28994 + ... + 29694.

It is an arithmetic number, because the mean of its divisors is an integer number (972972).

Almost surely, 2^20570144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20570144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23351328).

20570144 is an abundant number, since it is smaller than the sum of its proper divisors (26132512).

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

20570144 is a wasteful number, since it uses less digits than its factorization.

20570144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20570144 is about 4535.4320632107. The cubic root of 20570144 is about 273.9969808039.

Adding to 20570144 its reverse (44107502), we get a palindrome (64677646).

The spelling of 20570144 in words is "twenty million, five hundred seventy thousand, one hundred forty-four".