19420608961924 has 9 divisors (see below), whose sum is σ = 33986081107461. Its totient is φ = 9710300074080.

The previous prime is 19420608961861. The next prime is 19420608961927. The reversal of 19420608961924 is 42916980602491.

The square root of 19420608961924 is 4406882.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6567523547524 + 12853085414400 = 2562718^2 + 3585120^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19420608961927) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7712044 + ... + 9915484.

Almost surely, 2^{19420608961924} is an apocalyptic number.

19420608961924 is the 4406882-nd square number.

It is an amenable number.

19420608961924 is a deficient number, since it is larger than the sum of its proper divisors (14565472145537).

19420608961924 is an frugal number, since it uses more digits than its factorization.

19420608961924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4406886 (or 2203443 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 19420608961924 in words is "nineteen trillion, four hundred twenty billion, six hundred eight million, nine hundred sixty-one thousand, nine hundred twenty-four".