20734155863 has 4 divisors (see below), whose sum is σ = 20737356648. Its totient is φ = 20730955080.

The previous prime is 20734155833. The next prime is 20734155877. The reversal of 20734155863 is 36855143702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20734155863 - 2¹⁶ = 20734090327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734155803) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1590656 + ... + 1603637.

It is an arithmetic number, because the mean of its divisors is an integer number (5184339162).

Almost surely, 2^20734155863 is an apocalyptic number.

20734155863 is a deficient number, since it is larger than the sum of its proper divisors (3200785).

20734155863 is an equidigital number, since it uses as much as digits as its factorization.

20734155863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200784.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 20734155863 in words is "twenty billion, seven hundred thirty-four million, one hundred fifty-five thousand, eight hundred sixty-three".