20124420136 has 16 divisors (see below), whose sum is σ = 37853846100. Its totient is φ = 10030061184.

The previous prime is 20124420053. The next prime is 20124420161. The reversal of 20124420136 is 63102442102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13831171236 + 6293248900 = 117606^2 + 79330^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20124420136.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4015951 + ... + 4020958.

Almost surely, 2^20124420136 is an apocalyptic number.

It is an amenable number.

20124420136 is a deficient number, since it is larger than the sum of its proper divisors (17729425964).

20124420136 is a wasteful number, since it uses less digits than its factorization.

20124420136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8037228 (or 8037224 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 20124420136 its reverse (63102442102), we get a palindrome (83226862238).

The spelling of 20124420136 in words is "twenty billion, one hundred twenty-four million, four hundred twenty thousand, one hundred thirty-six".