19903029428 has 6 divisors (see below), whose sum is σ = 34830301506. Its totient is φ = 9951514712.

The previous prime is 19903029383. The next prime is 19903029437. The reversal of 19903029428 is 82492030991.

It can be written as a sum of positive squares in only one way, i.e., 19076581924 + 826447504 = 138118^2 + 28748^2 .

It is a super-2 number, since 2×19903029428² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2487878675 + ... + 2487878682.

It is an arithmetic number, because the mean of its divisors is an integer number (5805050251).

Almost surely, 2^19903029428 is an apocalyptic number.

It is an amenable number.

19903029428 is a deficient number, since it is larger than the sum of its proper divisors (14927272078).

19903029428 is a wasteful number, since it uses less digits than its factorization.

19903029428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975757361 (or 4975757359 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 19903029428 in words is "nineteen billion, nine hundred three million, twenty-nine thousand, four hundred twenty-eight".