20120340513 has 16 divisors (see below), whose sum is σ = 33017995136. Its totient is φ = 10612926720.

The previous prime is 20120340511. The next prime is 20120340553. The reversal of 20120340513 is 31504302102.

It is not a de Polignac number, because 20120340513 - 2¹ = 20120340511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20120340513.

It is not an unprimeable number, because it can be changed into a prime (20120340511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36850168 + ... + 36850713.

It is an arithmetic number, because the mean of its divisors is an integer number (2063624696).

Almost surely, 2^20120340513 is an apocalyptic number.

It is an amenable number.

20120340513 is a deficient number, since it is larger than the sum of its proper divisors (12897654623).

20120340513 is a wasteful number, since it uses less digits than its factorization.

20120340513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73700904.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20120340513 its reverse (31504302102), we get a palindrome (51624642615).

The spelling of 20120340513 in words is "twenty billion, one hundred twenty million, three hundred forty thousand, five hundred thirteen".