20448400864 has 12 divisors (see below), whose sum is σ = 40257789264. Its totient is φ = 10224200416.

The previous prime is 20448400849. The next prime is 20448400891. The reversal of 20448400864 is 46800484402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319506232 + ... + 319506295.

It is an arithmetic number, because the mean of its divisors is an integer number (3354815772).

Almost surely, 2^20448400864 is an apocalyptic number.

It is an amenable number.

20448400864 is a deficient number, since it is larger than the sum of its proper divisors (19809388400).

20448400864 is an equidigital number, since it uses as much as digits as its factorization.

20448400864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639012537 (or 639012529 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 40.

The spelling of 20448400864 in words is "twenty billion, four hundred forty-eight million, four hundred thousand, eight hundred sixty-four".