20712130 has 8 divisors (see below), whose sum is σ = 37281852. Its totient is φ = 8284848.

The previous prime is 20712113. The next prime is 20712143. The reversal of 20712130 is 3121702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 529 = 4551^2 + 23^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1035597 + ... + 1035616.

Almost surely, 2^20712130 is an apocalyptic number.

20712130 is a deficient number, since it is larger than the sum of its proper divisors (16569722).

20712130 is a wasteful number, since it uses less digits than its factorization.

20712130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071220.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20712130 is about 4551.0581187236. The cubic root of 20712130 is about 274.6259598009.

Adding to 20712130 its reverse (3121702), we get a palindrome (23833832).

The spelling of 20712130 in words is "twenty million, seven hundred twelve thousand, one hundred thirty".