20543142544 has 30 divisors (see below), whose sum is σ = 39874846470. Its totient is φ = 10252892160.

The previous prime is 20543142509. The next prime is 20543142559. The reversal of 20543142544 is 44524134502.

It can be written as a sum of positive squares in only one way, i.e., 12223513600 + 8319628944 = 110560^2 + 91212^2 .

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 5 ways as a sum of consecutive naturals, for example, 7638352 + ... + 7641040.

It is an arithmetic number, because the mean of its divisors is an integer number (1329161549).

Almost surely, 2^20543142544 is an apocalyptic number.

It is an amenable number.

20543142544 is a deficient number, since it is larger than the sum of its proper divisors (19331703926).

20543142544 is an frugal number, since it uses more digits than its factorization.

20543142544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079 (or 3382 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 34.

The spelling of 20543142544 in words is "twenty billion, five hundred forty-three million, one hundred forty-two thousand, five hundred forty-four".