19955696820 has 48 divisors (see below), whose sum is σ = 55886006400. Its totient is φ = 5320561536.

The previous prime is 19955696779. The next prime is 19955696821. The reversal of 19955696820 is 2869655991.

It is a super-2 number, since 2×19955696820² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19955696821) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 345114 + ... + 398766.

It is an arithmetic number, because the mean of its divisors is an integer number (1164291800).

Almost surely, 2^19955696820 is an apocalyptic number.

19955696820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19955696820 is an abundant number, since it is smaller than the sum of its proper divisors (35930309580).

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

19955696820 is a wasteful number, since it uses less digits than its factorization.

19955696820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59864 (or 59862 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 60.

The spelling of 19955696820 in words is "nineteen billion, nine hundred fifty-five million, six hundred ninety-six thousand, eight hundred twenty".