20643365142 has 24 divisors (see below), whose sum is σ = 45460527840. Its totient is φ = 6768316080.

The previous prime is 20643365131. The next prime is 20643365177. The reversal of 20643365142 is 24156334602.

20643365142 is a `hidden beast` number, since 2 + 0 + 643 + 3 + 6 + 5 + 1 + 4 + 2 = 666.

20643365142 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×20643365142² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20643365097 and 20643365106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9399342 + ... + 9401537.

It is an arithmetic number, because the mean of its divisors is an integer number (1894188660).

Almost surely, 2^20643365142 is an apocalyptic number.

20643365142 is an abundant number, since it is smaller than the sum of its proper divisors (24817162698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20643365142 is a wasteful number, since it uses less digits than its factorization.

20643365142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18800948 (or 18800945 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 20643365142 its reverse (24156334602), we get a palindrome (44799699744).

The spelling of 20643365142 in words is "twenty billion, six hundred forty-three million, three hundred sixty-five thousand, one hundred forty-two".