19903029427 has 4 divisors (see below), whose sum is σ = 19903320000. Its totient is φ = 19902738856.

The previous prime is 19903029383. The next prime is 19903029437. The reversal of 19903029427 is 72492030991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19903029427 is a prime.

It is a super-2 number, since 2×19903029427² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19903029437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20574 + ... + 200572.

It is an arithmetic number, because the mean of its divisors is an integer number (4975830000).

Almost surely, 2^19903029427 is an apocalyptic number.

19903029427 is a deficient number, since it is larger than the sum of its proper divisors (290573).

19903029427 is a wasteful number, since it uses less digits than its factorization.

19903029427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290572.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 19903029427 in words is "nineteen billion, nine hundred three million, twenty-nine thousand, four hundred twenty-seven".