20449985143 has 8 divisors (see below), whose sum is σ = 23374800288. Its totient is φ = 17526017184.

The previous prime is 20449985141. The next prime is 20449985161. The reversal of 20449985143 is 34158994402.

It is a happy number.

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 20449985143 - 2¹ = 20449985141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20449985141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159196 + ... + 257377.

It is an arithmetic number, because the mean of its divisors is an integer number (2921850036).

Almost surely, 2^20449985143 is an apocalyptic number.

20449985143 is a deficient number, since it is larger than the sum of its proper divisors (2924815145).

20449985143 is an equidigital number, since it uses as much as digits as its factorization.

20449985143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423593.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 20449985143 in words is "twenty billion, four hundred forty-nine million, nine hundred eighty-five thousand, one hundred forty-three".