20423445342516 has 18 divisors (see below), whose sum is σ = 51625931282562. Its totient is φ = 6807815114160.

The previous prime is 20423445342497. The next prime is 20423445342527. The reversal of 20423445342516 is 61524354432402.

20423445342516 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 3 + 44 + 53 + 42 + 516 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20303549354916 + 119895987600 = 4505946^2 + 346260^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×20423445342516³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 283658963055 + ... + 283658963126.

Almost surely, 2^{20423445342516} is an apocalyptic number.

It is an amenable number.

20423445342516 is an abundant number, since it is smaller than the sum of its proper divisors (31202485940046).

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

20423445342516 is a wasteful number, since it uses less digits than its factorization.

20423445342516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567317926191 (or 567317926186 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 45.

Adding to 20423445342516 its reverse (61524354432402), we get a palindrome (81947799774918).

The spelling of 20423445342516 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-five million, three hundred forty-two thousand, five hundred sixteen".