20939496542 has 8 divisors (see below), whose sum is σ = 31415190336. Its totient is φ = 10467766432.

The previous prime is 20939496521. The next prime is 20939496551. The reversal of 20939496542 is 24569493902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 977678 + ... + 998865.

It is an arithmetic number, because the mean of its divisors is an integer number (3926898792).

Almost surely, 2^20939496542 is an apocalyptic number.

20939496542 is a deficient number, since it is larger than the sum of its proper divisors (10475693794).

20939496542 is a wasteful number, since it uses less digits than its factorization.

20939496542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981842.

The product of its (nonzero) digits is 4199040, while the sum is 53.

The spelling of 20939496542 in words is "twenty billion, nine hundred thirty-nine million, four hundred ninety-six thousand, five hundred forty-two".