20357244013 has 4 divisors (see below), whose sum is σ = 20358879040. Its totient is φ = 20355608988.

The previous prime is 20357243981. The next prime is 20357244023. The reversal of 20357244013 is 31044275302.

It is a happy number.

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 20357244013 - 2⁵ = 20357243981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20357244023) 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 3 ways as a sum of consecutive naturals, for example, 798693 + ... + 823786.

It is an arithmetic number, because the mean of its divisors is an integer number (5089719760).

Almost surely, 2^20357244013 is an apocalyptic number.

It is an amenable number.

20357244013 is a deficient number, since it is larger than the sum of its proper divisors (1635027).

20357244013 is a wasteful number, since it uses less digits than its factorization.

20357244013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635026.

The product of its (nonzero) digits is 20160, while the sum is 31.

The spelling of 20357244013 in words is "twenty billion, three hundred fifty-seven million, two hundred forty-four thousand, thirteen".