19781733020 has 48 divisors (see below), whose sum is σ = 49007659008. Its totient is φ = 6563522880.

The previous prime is 19781733019. The next prime is 19781733047. The reversal of 19781733020 is 2033718791.

It is a super-2 number, since 2×19781733020² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2274662 + ... + 2283341.

It is an arithmetic number, because the mean of its divisors is an integer number (1020992896).

Almost surely, 2^19781733020 is an apocalyptic number.

19781733020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19781733020 is an abundant number, since it is smaller than the sum of its proper divisors (29225925988).

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

19781733020 is a wasteful number, since it uses less digits than its factorization.

19781733020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4558050 (or 4558048 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 19781733020 in words is "nineteen billion, seven hundred eighty-one million, seven hundred thirty-three thousand, twenty".