20570046 has 64 divisors (see below), whose sum is σ = 50112000. Its totient is φ = 5498496.

The previous prime is 20570041. The next prime is 20570057. The reversal of 20570046 is 64007502.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20569998 and 20570025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20570041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118816 + ... + 118988.

It is an arithmetic number, because the mean of its divisors is an integer number (783000).

Almost surely, 2^20570046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20570046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25056000).

20570046 is an abundant number, since it is smaller than the sum of its proper divisors (29541954).

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

20570046 is a wasteful number, since it uses less digits than its factorization.

20570046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20570046 is about 4535.4212593760. The cubic root of 20570046 is about 273.9965456790.

Adding to 20570046 its reverse (64007502), we get a palindrome (84577548).

The spelling of 20570046 in words is "twenty million, five hundred seventy thousand, forty-six".