20139355834 has 24 divisors (see below), whose sum is σ = 33839558460. Its totient is φ = 8974562688.

The previous prime is 20139355823. The next prime is 20139355849. The reversal of 20139355834 is 43855393102.

It can be written as a sum of positive squares in 6 ways, for example, as 5120118025 + 15019237809 = 71555^2 + 122553^2 .

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 11 ways as a sum of consecutive naturals, for example, 1017507 + ... + 1037110.

Almost surely, 2^20139355834 is an apocalyptic number.

20139355834 is a deficient number, since it is larger than the sum of its proper divisors (13700202626).

20139355834 is a wasteful number, since it uses less digits than its factorization.

20139355834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054674 (or 2054661 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 20139355834 in words is "twenty billion, one hundred thirty-nine million, three hundred fifty-five thousand, eight hundred thirty-four".