20124004013 has 4 divisors (see below), whose sum is σ = 20125762560. Its totient is φ = 20122245468.

The previous prime is 20124004009. The next prime is 20124004049. The reversal of 20124004013 is 31040042102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20124004013 - 2² = 20124004009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20124003982 and 20124004000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124004073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861995 + ... + 885032.

It is an arithmetic number, because the mean of its divisors is an integer number (5031440640).

Almost surely, 2^20124004013 is an apocalyptic number.

It is an amenable number.

20124004013 is a deficient number, since it is larger than the sum of its proper divisors (1758547).

20124004013 is a wasteful number, since it uses less digits than its factorization.

20124004013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758546.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20124004013 its reverse (31040042102), we get a palindrome (51164046115).

The spelling of 20124004013 in words is "twenty billion, one hundred twenty-four million, four thousand, thirteen".