20451235143 has 16 divisors (see below), whose sum is σ = 28982170880. Its totient is φ = 12791162304.

The previous prime is 20451235141. The next prime is 20451235159. The reversal of 20451235143 is 34153215402.

It is not a de Polignac number, because 20451235143 - 2¹ = 20451235141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20451235143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451235141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1735846 + ... + 1747587.

It is an arithmetic number, because the mean of its divisors is an integer number (1811385680).

Almost surely, 2^20451235143 is an apocalyptic number.

20451235143 is a deficient number, since it is larger than the sum of its proper divisors (8530935737).

20451235143 is a wasteful number, since it uses less digits than its factorization.

20451235143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483558.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 20451235143 in words is "twenty billion, four hundred fifty-one million, two hundred thirty-five thousand, one hundred forty-three".