19933709542 has 4 divisors (see below), whose sum is σ = 29900564316. Its totient is φ = 9966854770.

The previous prime is 19933709539. The next prime is 19933709569. The reversal of 19933709542 is 24590733991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×19933709542² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19933709542.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 4983427384 + ... + 4983427387.

It is an arithmetic number, because the mean of its divisors is an integer number (7475141079).

Almost surely, 2^19933709542 is an apocalyptic number.

19933709542 is a deficient number, since it is larger than the sum of its proper divisors (9966854774).

19933709542 is an equidigital number, since it uses as much as digits as its factorization.

19933709542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9966854773.

The product of its (nonzero) digits is 1837080, while the sum is 52.

The spelling of 19933709542 in words is "nineteen billion, nine hundred thirty-three million, seven hundred nine thousand, five hundred forty-two".