20397130 has 16 divisors (see below), whose sum is σ = 39539304. Its totient is φ = 7531200.

The previous prime is 20397079. The next prime is 20397137. The reversal of 20397130 is 3179302.

It can be written as a sum of positive squares in 4 ways, for example, as 8473921 + 11923209 = 2911^2 + 3453^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20397095 and 20397104.

It is not an unprimeable number, because it can be changed into a prime (20397137) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 78321 + ... + 78580.

Almost surely, 2^20397130 is an apocalyptic number.

20397130 is a deficient number, since it is larger than the sum of its proper divisors (19142174).

20397130 is a wasteful number, since it uses less digits than its factorization.

20397130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156921.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 20397130 is about 4516.3181907390. The cubic root of 20397130 is about 273.2266273288.

The spelling of 20397130 in words is "twenty million, three hundred ninety-seven thousand, one hundred thirty".