20542142505 has 32 divisors (see below), whose sum is σ = 34954012800. Its totient is φ = 10272172032.

The previous prime is 20542142479. The next prime is 20542142557. The reversal of 20542142505 is 50524124502.

It is not a de Polignac number, because 20542142505 - 2⁶ = 20542142441 is a prime.

It is an unprimeable number.

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, 343890 + ... + 399179.

It is an arithmetic number, because the mean of its divisors is an integer number (1092312900).

Almost surely, 2^20542142505 is an apocalyptic number.

It is an amenable number.

20542142505 is a deficient number, since it is larger than the sum of its proper divisors (14411870295).

20542142505 is a wasteful number, since it uses less digits than its factorization.

20542142505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743193.

The product of its (nonzero) digits is 16000, while the sum is 30.

The spelling of 20542142505 in words is "twenty billion, five hundred forty-two million, one hundred forty-two thousand, five hundred five".