20356744613 has 16 divisors (see below), whose sum is σ = 20896102656. Its totient is φ = 19823643840.

The previous prime is 20356744579. The next prime is 20356744621. The reversal of 20356744613 is 31644765302.

It is a cyclic number.

It is not a de Polignac number, because 20356744613 - 2²⁴ = 20339967397 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 (20356744633) 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 15 ways as a sum of consecutive naturals, for example, 4832078 + ... + 4836288.

It is an arithmetic number, because the mean of its divisors is an integer number (1306006416).

Almost surely, 2^20356744613 is an apocalyptic number.

It is an amenable number.

20356744613 is a deficient number, since it is larger than the sum of its proper divisors (539358043).

20356744613 is a wasteful number, since it uses less digits than its factorization.

20356744613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924.

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 20356744613 in words is "twenty billion, three hundred fifty-six million, seven hundred forty-four thousand, six hundred thirteen".