20107730 has 16 divisors (see below), whose sum is σ = 37442520. Its totient is φ = 7765632.

The previous prime is 20107729. The next prime is 20107733. The reversal of 20107730 is 3770102.

It can be written as a sum of positive squares in 4 ways, for example, as 16394401 + 3713329 = 4049^2 + 1927^2 .

It is not an unprimeable number, because it can be changed into a prime (20107733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34379 + ... + 34958.

Almost surely, 2^20107730 is an apocalyptic number.

20107730 is a deficient number, since it is larger than the sum of its proper divisors (17334790).

20107730 is a wasteful number, since it uses less digits than its factorization.

20107730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69373.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 20107730 is about 4484.1643591644. The cubic root of 20107730 is about 271.9282628724.

Adding to 20107730 its reverse (3770102), we get a palindrome (23877832).

The spelling of 20107730 in words is "twenty million, one hundred seven thousand, seven hundred thirty".