20312443645623 has 24 divisors (see below), whose sum is σ = 29894128617600. Its totient is φ = 13285973937600.

The previous prime is 20312443645601. The next prime is 20312443645651. The reversal of 20312443645623 is 32654634421302.

20312443645623 is a `hidden beast` number, since 2 + 0 + 3 + 1 + 24 + 4 + 3 + 64 + 562 + 3 = 666.

It is not a de Polignac number, because 20312443645623 - 2⁸ = 20312443645367 is a prime.

It is a super-2 number, since 2×20312443645623² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312443645223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53783898 + ... + 54160248.

It is an arithmetic number, because the mean of its divisors is an integer number (1245588692400).

Almost surely, 2^{20312443645623} is an apocalyptic number.

20312443645623 is a deficient number, since it is larger than the sum of its proper divisors (9581684971977).

20312443645623 is a wasteful number, since it uses less digits than its factorization.

20312443645623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489559 (or 489556 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 45.

The spelling of 20312443645623 in words is "twenty trillion, three hundred twelve billion, four hundred forty-three million, six hundred forty-five thousand, six hundred twenty-three".