20996247680 has 32 divisors (see below), whose sum is σ = 50194156140. Its totient is φ = 8398498816.

The previous prime is 20996247653. The next prime is 20996247691. The reversal of 20996247680 is 8674269902.

It can be written as a sum of positive squares in 2 ways, for example, as 20075489344 + 920758336 = 141688^2 + 30344^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16402679 + ... + 16403958.

Almost surely, 2^20996247680 is an apocalyptic number.

20996247680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20996247680 is an abundant number, since it is smaller than the sum of its proper divisors (29197908460).

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

20996247680 is an equidigital number, since it uses as much as digits as its factorization.

20996247680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32806656 (or 32806644 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 20996247680 in words is "twenty billion, nine hundred ninety-six million, two hundred forty-seven thousand, six hundred eighty".