20730788 has 12 divisors (see below), whose sum is σ = 39069660. Its totient is φ = 9568032.

The previous prime is 20730781. The next prime is 20730799. The reversal of 20730788 is 88703702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9048064 + 11682724 = 3008^2 + 3418^2 .

It is a super-2 number, since 2×20730788² = 859531142201888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20730781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199283 + ... + 199386.

It is an arithmetic number, because the mean of its divisors is an integer number (3255805).

Almost surely, 2^20730788 is an apocalyptic number.

It is an amenable number.

20730788 is a deficient number, since it is larger than the sum of its proper divisors (18338872).

20730788 is a wasteful number, since it uses less digits than its factorization.

20730788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398686 (or 398684 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20730788 is about 4553.1075102615. The cubic root of 20730788 is about 274.7083983418.

The spelling of 20730788 in words is "twenty million, seven hundred thirty thousand, seven hundred eighty-eight".