20271017984 has 208 divisors, whose sum is σ = 49256087040. Its totient is φ = 8153333760.

The previous prime is 20271017971. The next prime is 20271018011. The reversal of 20271017984 is 48971017202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38907644 + ... + 38908164.

Almost surely, 2^20271017984 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 20271017984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24628043520).

20271017984 is an abundant number, since it is smaller than the sum of its proper divisors (28985069056).

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

20271017984 is an equidigital number, since it uses as much as digits as its factorization.

20271017984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The spelling of 20271017984 in words is "twenty billion, two hundred seventy-one million, seventeen thousand, nine hundred eighty-four".