20412001243 has 4 divisors (see below), whose sum is σ = 21070452928. Its totient is φ = 19753549560.

The previous prime is 20412001241. The next prime is 20412001261. The reversal of 20412001243 is 34210021402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20412001243 - 2¹ = 20412001241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20412001243.

It is not an unprimeable number, because it can be changed into a prime (20412001241) 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, 329225796 + ... + 329225857.

It is an arithmetic number, because the mean of its divisors is an integer number (5267613232).

Almost surely, 2^20412001243 is an apocalyptic number.

20412001243 is a deficient number, since it is larger than the sum of its proper divisors (658451685).

20412001243 is an equidigital number, since it uses as much as digits as its factorization.

20412001243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658451684.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20412001243 its reverse (34210021402), we get a palindrome (54622022645).

The spelling of 20412001243 in words is "twenty billion, four hundred twelve million, one thousand, two hundred forty-three".