20506213206743 has 16 divisors (see below), whose sum is σ = 22510398960000. Its totient is φ = 18525497198880.

The previous prime is 20506213206737. The next prime is 20506213206797. The reversal of 20506213206743 is 34760231260502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20506213206743 - 2¹⁰ = 20506213205719 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 20506213206743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506213206733) 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, 522296 + ... + 6425357.

It is an arithmetic number, because the mean of its divisors is an integer number (1406899935000).

Almost surely, 2^{20506213206743} is an apocalyptic number.

20506213206743 is a deficient number, since it is larger than the sum of its proper divisors (2004185753257).

20506213206743 is a wasteful number, since it uses less digits than its factorization.

20506213206743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6949342.

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

The spelling of 20506213206743 in words is "twenty trillion, five hundred six billion, two hundred thirteen million, two hundred six thousand, seven hundred forty-three".