19766881740 has 24 divisors (see below), whose sum is σ = 55347269040. Its totient is φ = 5271168448.

The previous prime is 19766881727. The next prime is 19766881787. The reversal of 19766881740 is 4718866791.

It is a happy number.

It is a super-2 number, since 2×19766881740² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 164723955 + ... + 164724074.

It is an arithmetic number, because the mean of its divisors is an integer number (2306136210).

Almost surely, 2^19766881740 is an apocalyptic number.

19766881740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19766881740 is an abundant number, since it is smaller than the sum of its proper divisors (35580387300).

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

19766881740 is a wasteful number, since it uses less digits than its factorization.

19766881740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329448041 (or 329448039 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 19766881740 in words is "nineteen billion, seven hundred sixty-six million, eight hundred eighty-one thousand, seven hundred forty".