20154531144 has 32 divisors (see below), whose sum is σ = 54966903840. Its totient is φ = 6107433600.

The previous prime is 20154531121. The next prime is 20154531151. The reversal of 20154531144 is 44113545102.

It is an unprimeable number.

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, 38171197 + ... + 38171724.

It is an arithmetic number, because the mean of its divisors is an integer number (1717715745).

Almost surely, 2^20154531144 is an apocalyptic number.

20154531144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20154531144 is an abundant number, since it is smaller than the sum of its proper divisors (34812372696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20154531144 is a wasteful number, since it uses less digits than its factorization.

20154531144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76342941 (or 76342937 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 20154531144 in words is "twenty billion, one hundred fifty-four million, five hundred thirty-one thousand, one hundred forty-four".