19815706930 has 16 divisors (see below), whose sum is σ = 35795210904. Its totient is φ = 7898074240.

The previous prime is 19815706927. The next prime is 19815706951. The reversal of 19815706930 is 3960751891.

It can be written as a sum of positive squares in 4 ways, for example, as 18843327441 + 972379489 = 137271^2 + 31183^2 .

It is a super-2 number, since 2×19815706930² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 3523117 + ... + 3528736.

Almost surely, 2^19815706930 is an apocalyptic number.

19815706930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19815706930 is a deficient number, since it is larger than the sum of its proper divisors (15979503974).

19815706930 is a wasteful number, since it uses less digits than its factorization.

19815706930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7052141.

The product of its (nonzero) digits is 408240, while the sum is 49.

The spelling of 19815706930 in words is "nineteen billion, eight hundred fifteen million, seven hundred six thousand, nine hundred thirty".