19639800446 has 24 divisors (see below), whose sum is σ = 34539307776. Its totient is φ = 8350776000.

The previous prime is 19639800421. The next prime is 19639800457. The reversal of 19639800446 is 64400893691.

It is a junction number, because it is equal to n+sod(n) for n = 19639800394 and 19639800403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 776555 + ... + 801446.

It is an arithmetic number, because the mean of its divisors is an integer number (1439137824).

Almost surely, 2^19639800446 is an apocalyptic number.

19639800446 is a deficient number, since it is larger than the sum of its proper divisors (14899507330).

19639800446 is a wasteful number, since it uses less digits than its factorization.

19639800446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578144 (or 1578137 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 19639800446 in words is "nineteen billion, six hundred thirty-nine million, eight hundred thousand, four hundred forty-six".