20789240 has 64 divisors (see below), whose sum is σ = 49766400. Its totient is φ = 7798912.

The previous prime is 20789221. The next prime is 20789261. The reversal of 20789240 is 4298702.

It is a junction number, because it is equal to n+sod(n) for n = 20789197 and 20789206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54089 + ... + 54471.

It is an arithmetic number, because the mean of its divisors is an integer number (777600).

Almost surely, 2^20789240 is an apocalyptic number.

20789240 is a gapful number since it is divisible by the number (20) 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 20789240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24883200).

20789240 is an abundant number, since it is smaller than the sum of its proper divisors (28977160).

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

20789240 is a wasteful number, since it uses less digits than its factorization.

20789240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20789240 is about 4559.5219047615. The cubic root of 20789240 is about 274.9663429884.

The spelling of 20789240 in words is "twenty million, seven hundred eighty-nine thousand, two hundred forty".