20151142443 has 32 divisors (see below), whose sum is σ = 30839040000. Its totient is φ = 12991255200.

The previous prime is 20151142409. The next prime is 20151142463. The reversal of 20151142443 is 34424115102.

20151142443 is a `hidden beast` number, since 201 + 5 + 1 + 14 + 2 + 443 = 666.

It is not a de Polignac number, because 20151142443 - 2⁹ = 20151141931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20151142463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1246633 + ... + 1262693.

It is an arithmetic number, because the mean of its divisors is an integer number (963720000).

Almost surely, 2^20151142443 is an apocalyptic number.

20151142443 is a deficient number, since it is larger than the sum of its proper divisors (10687897557).

20151142443 is a wasteful number, since it uses less digits than its factorization.

20151142443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17600 (or 17594 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 20151142443 its reverse (34424115102), we get a palindrome (54575257545).

The spelling of 20151142443 in words is "twenty billion, one hundred fifty-one million, one hundred forty-two thousand, four hundred forty-three".