20534328643 has 2 divisors, whose sum is σ = 20534328644. Its totient is φ = 20534328642.

The previous prime is 20534328547. The next prime is 20534328653. The reversal of 20534328643 is 34682343502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20534328643 - 2⁹ = 20534328131 is a prime.

It is a super-3 number, since 3×20534328643³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20534328596 and 20534328605.

It is not a weakly prime, because it can be changed into another prime (20534328653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267164321 + 10267164322.

It is an arithmetic number, because the mean of its divisors is an integer number (10267164322).

Almost surely, 2^20534328643 is an apocalyptic number.

20534328643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20534328643 is an equidigital number, since it uses as much as digits as its factorization.

20534328643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 40.

The spelling of 20534328643 in words is "twenty billion, five hundred thirty-four million, three hundred twenty-eight thousand, six hundred forty-three".