20781302976 has 420 divisors, whose sum is σ = 74796475248. Its totient is φ = 5677765632.

The previous prime is 20781302963. The next prime is 20781302981. The reversal of 20781302976 is 67920318702.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 5840590 + ... + 5844146.

Almost surely, 2^20781302976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20781302976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37398237624).

20781302976 is an abundant number, since it is smaller than the sum of its proper divisors (54015172272).

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

20781302976 is a wasteful number, since it uses less digits than its factorization.

20781302976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618 (or 3592 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 20781302976 in words is "twenty billion, seven hundred eighty-one million, three hundred two thousand, nine hundred seventy-six".