20356771451 has 4 divisors (see below), whose sum is σ = 20367794832. Its totient is φ = 20345748072.

The previous prime is 20356771433. The next prime is 20356771471. The reversal of 20356771451 is 15417765302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20356771451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20356771399 and 20356771408.

It is not an unprimeable number, because it can be changed into a prime (20356771411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5508920 + ... + 5512613.

It is an arithmetic number, because the mean of its divisors is an integer number (5091948708).

Almost surely, 2^20356771451 is an apocalyptic number.

20356771451 is a deficient number, since it is larger than the sum of its proper divisors (11023381).

20356771451 is a wasteful number, since it uses less digits than its factorization.

20356771451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11023380.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 20356771451 in words is "twenty billion, three hundred fifty-six million, seven hundred seventy-one thousand, four hundred fifty-one".