20731213210 has 32 divisors (see below), whose sum is σ = 39548561040. Its totient is φ = 7797322752.

The previous prime is 20731213207. The next prime is 20731213219. The reversal of 20731213210 is 1231213702.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4863528121 + 15867685089 = 69739^2 + 125967^2 .

It is not an unprimeable number, because it can be changed into a prime (20731213219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124692 + ... + 238768.

Almost surely, 2^20731213210 is an apocalyptic number.

20731213210 is a deficient number, since it is larger than the sum of its proper divisors (18817347830).

20731213210 is a wasteful number, since it uses less digits than its factorization.

20731213210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115170.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 20731213210 its reverse (1231213702), we get a palindrome (21962426912).

The spelling of 20731213210 in words is "twenty billion, seven hundred thirty-one million, two hundred thirteen thousand, two hundred ten".