20090730 has 64 divisors (see below), whose sum is σ = 54908928. Its totient is φ = 4656960.

The previous prime is 20090729. The next prime is 20090743. The reversal of 20090730 is 3709002.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20090697 and 20090706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6267 + ... + 8913.

It is an arithmetic number, because the mean of its divisors is an integer number (857952).

Almost surely, 2^20090730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20090730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27454464).

20090730 is an abundant number, since it is smaller than the sum of its proper divisors (34818198).

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

20090730 is a wasteful number, since it uses less digits than its factorization.

20090730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 20090730 is about 4482.2683989248. The cubic root of 20090730 is about 271.8516077112.

Adding to 20090730 its reverse (3709002), we get a palindrome (23799732).

The spelling of 20090730 in words is "twenty million, ninety thousand, seven hundred thirty".