20790042 has 96 divisors (see below), whose sum is σ = 53758080. Its totient is φ = 5241600.

The previous prime is 20790023. The next prime is 20790043. The reversal of 20790042 is 24009702.

It is a junction number, because it is equal to n+sod(n) for n = 20789994 and 20790021.

It is not an unprimeable number, because it can be changed into a prime (20790043) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 205792 + ... + 205892.

It is an arithmetic number, because the mean of its divisors is an integer number (559980).

Almost surely, 2^20790042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20790042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26879040).

20790042 is an abundant number, since it is smaller than the sum of its proper divisors (32968038).

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

20790042 is a wasteful number, since it uses less digits than its factorization.

20790042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20790042 is about 4559.6098517307. The cubic root of 20790042 is about 274.9698787946.

Adding to 20790042 its reverse (24009702), we get a palindrome (44799744).

The spelling of 20790042 in words is "twenty million, seven hundred ninety thousand, forty-two".