20940320 has 48 divisors (see below), whose sum is σ = 51188760. Its totient is φ = 8085504.

The previous prime is 20940289. The next prime is 20940329. The reversal of 20940320 is 2304902.

It can be written as a sum of positive squares in 4 ways, for example, as 9461776 + 11478544 = 3076^2 + 3388^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20940292 and 20940301.

It is not an unprimeable number, because it can be changed into a prime (20940329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2384 + ... + 6896.

Almost surely, 2^20940320 is an apocalyptic number.

20940320 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 20940320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25594380).

20940320 is an abundant number, since it is smaller than the sum of its proper divisors (30248440).

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

20940320 is a wasteful number, since it uses less digits than its factorization.

20940320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557 (or 4549 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20940320 is about 4576.0594401734. The cubic root of 20940320 is about 275.6308163409.

The spelling of 20940320 in words is "twenty million, nine hundred forty thousand, three hundred twenty".