19953953820 has 36 divisors (see below), whose sum is σ = 60526993800. Its totient is φ = 5321054304.

The previous prime is 19953953819. The next prime is 19953953827. The reversal of 19953953820 is 2835935991.

19953953820 is a `hidden beast` number, since 19 + 95 + 3 + 9 + 538 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19953953827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55427470 + ... + 55427829.

Almost surely, 2^19953953820 is an apocalyptic number.

19953953820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19953953820 is an abundant number, since it is smaller than the sum of its proper divisors (40573039980).

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

19953953820 is a wasteful number, since it uses less digits than its factorization.

19953953820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110855314 (or 110855309 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The spelling of 19953953820 in words is "nineteen billion, nine hundred fifty-three million, nine hundred fifty-three thousand, eight hundred twenty".