19772420976 has 320 divisors, whose sum is σ = 72269660160. Its totient is φ = 5026026240.

The previous prime is 19772420963. The next prime is 19772420981. The reversal of 19772420976 is 67902427791.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1557085 + ... + 1569731.

It is an arithmetic number, because the mean of its divisors is an integer number (225842688).

Almost surely, 2^19772420976 is an apocalyptic number.

19772420976 is a gapful number since it is divisible by the number (16) 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 19772420976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36134830080).

19772420976 is an abundant number, since it is smaller than the sum of its proper divisors (52497239184).

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

19772420976 is a wasteful number, since it uses less digits than its factorization.

19772420976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12729 (or 12717 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The spelling of 19772420976 in words is "nineteen billion, seven hundred seventy-two million, four hundred twenty thousand, nine hundred seventy-six".