19708479420 has 96 divisors (see below), whose sum is σ = 64605413376. Its totient is φ = 4394918400.

The previous prime is 19708479409. The next prime is 19708479437. The reversal of 19708479420 is 2497480791.

It is a super-2 number, since 2×19708479420² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 555036 + ... + 589475.

It is an arithmetic number, because the mean of its divisors is an integer number (672973056).

Almost surely, 2^19708479420 is an apocalyptic number.

19708479420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19708479420 is an abundant number, since it is smaller than the sum of its proper divisors (44896933956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19708479420 is a wasteful number, since it uses less digits than its factorization.

19708479420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144571 (or 1144569 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 19708479420 in words is "nineteen billion, seven hundred eight million, four hundred seventy-nine thousand, four hundred twenty".