19808796256 has 24 divisors (see below), whose sum is σ = 41051125080. Its totient is φ = 9383113728.

The previous prime is 19808796247. The next prime is 19808796263. The reversal of 19808796256 is 65269780891.

It is a super-2 number, since 2×19808796256² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19808796194 and 19808796203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16289521 + ... + 16290736.

It is an arithmetic number, because the mean of its divisors is an integer number (1710463545).

Almost surely, 2^19808796256 is an apocalyptic number.

19808796256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19808796256 is an abundant number, since it is smaller than the sum of its proper divisors (21242328824).

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

19808796256 is a wasteful number, since it uses less digits than its factorization.

19808796256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32580286 (or 32580278 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 19808796256 in words is "nineteen billion, eight hundred eight million, seven hundred ninety-six thousand, two hundred fifty-six".