19985279444 has 48 divisors (see below), whose sum is σ = 38143531776. Its totient is φ = 9107424000.

The previous prime is 19985279359. The next prime is 19985279467. The reversal of 19985279444 is 44497258991.

It is a super-2 number, since 2×19985279444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1303664 + ... + 1318904.

It is an arithmetic number, because the mean of its divisors is an integer number (794656912).

Almost surely, 2^19985279444 is an apocalyptic number.

It is an amenable number.

19985279444 is a deficient number, since it is larger than the sum of its proper divisors (18158252332).

19985279444 is a wasteful number, since it uses less digits than its factorization.

19985279444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15576 (or 15574 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 62.

The spelling of 19985279444 in words is "nineteen billion, nine hundred eighty-five million, two hundred seventy-nine thousand, four hundred forty-four".