20131455144 has 32 divisors (see below), whose sum is σ = 50444896320. Its totient is φ = 6694983936.

The previous prime is 20131455143. The next prime is 20131455167. The reversal of 20131455144 is 44155413102.

It is not an unprimeable number, because it can be changed into a prime (20131455143) 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, 958212 + ... + 978995.

It is an arithmetic number, because the mean of its divisors is an integer number (1576403010).

Almost surely, 2^20131455144 is an apocalyptic number.

20131455144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20131455144 is an abundant number, since it is smaller than the sum of its proper divisors (30313441176).

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

20131455144 is a wasteful number, since it uses less digits than its factorization.

20131455144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937649 (or 1937645 counting only the distinct ones).

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

Adding to 20131455144 its reverse (44155413102), we get a palindrome (64286868246).

The spelling of 20131455144 in words is "twenty billion, one hundred thirty-one million, four hundred fifty-five thousand, one hundred forty-four".