20451544043 has 4 divisors (see below), whose sum is σ = 23373193200. Its totient is φ = 17529894888.

The previous prime is 20451544033. The next prime is 20451544049. The reversal of 20451544043 is 34044515402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34044515402 = 2 ⋅17022257701.

It is a cyclic number.

It is not a de Polignac number, because 20451544043 - 2⁶ = 20451543979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20451544049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460824568 + ... + 1460824581.

It is an arithmetic number, because the mean of its divisors is an integer number (5843298300).

Almost surely, 2^20451544043 is an apocalyptic number.

20451544043 is a deficient number, since it is larger than the sum of its proper divisors (2921649157).

20451544043 is an equidigital number, since it uses as much as digits as its factorization.

20451544043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921649156.

The product of its (nonzero) digits is 38400, while the sum is 32.

The spelling of 20451544043 in words is "twenty billion, four hundred fifty-one million, five hundred forty-four thousand, forty-three".