19976785920 has 832 divisors, whose sum is σ = 87629283840. Its totient is φ = 4204265472.

The previous prime is 19976785909. The next prime is 19976785937. The reversal of 19976785920 is 2958767991.

It is a tau number, because it is divible by the number of its divisors (832).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50319162 + ... + 50319558.

Almost surely, 2^19976785920 is an apocalyptic number.

19976785920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19976785920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43814641920).

19976785920 is an abundant number, since it is smaller than the sum of its proper divisors (67652497920).

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

19976785920 is a wasteful number, since it uses less digits than its factorization.

19976785920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 63.

The spelling of 19976785920 in words is "nineteen billion, nine hundred seventy-six million, seven hundred eighty-five thousand, nine hundred twenty".