20356744623 has 16 divisors (see below), whose sum is σ = 27599717376. Its totient is φ = 13343510880.

The previous prime is 20356744621. The next prime is 20356744631. The reversal of 20356744623 is 32644765302.

It is not a de Polignac number, because 20356744623 - 2¹ = 20356744621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356744621) 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, 52036 + ... + 208377.

It is an arithmetic number, because the mean of its divisors is an integer number (1724982336).

Almost surely, 2^20356744623 is an apocalyptic number.

20356744623 is a deficient number, since it is larger than the sum of its proper divisors (7242972753).

20356744623 is a wasteful number, since it uses less digits than its factorization.

20356744623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260854.

The product of its (nonzero) digits is 725760, while the sum is 42.

The spelling of 20356744623 in words is "twenty billion, three hundred fifty-six million, seven hundred forty-four thousand, six hundred twenty-three".