20451854143 has 8 divisors (see below), whose sum is σ = 23464497312. Its totient is φ = 17461948416.

The previous prime is 20451854107. The next prime is 20451854153. The reversal of 20451854143 is 34145815402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20451854143 - 2²¹ = 20449756991 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 (20451854153) 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 7 ways as a sum of consecutive naturals, for example, 5682430 + ... + 5686027.

It is an arithmetic number, because the mean of its divisors is an integer number (2933062164).

Almost surely, 2^20451854143 is an apocalyptic number.

20451854143 is a deficient number, since it is larger than the sum of its proper divisors (3012643169).

20451854143 is a wasteful number, since it uses less digits than its factorization.

20451854143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11368721.

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 20451854143 in words is "twenty billion, four hundred fifty-one million, eight hundred fifty-four thousand, one hundred forty-three".