19906863748 has 6 divisors (see below), whose sum is σ = 34837011566. Its totient is φ = 9953431872.

The previous prime is 19906863731. The next prime is 19906863797. The reversal of 19906863748 is 84736860991.

It can be written as a sum of positive squares in only one way, i.e., 19870285444 + 36578304 = 140962^2 + 6048^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2488357965 + ... + 2488357972.

Almost surely, 2^19906863748 is an apocalyptic number.

It is an amenable number.

19906863748 is a deficient number, since it is larger than the sum of its proper divisors (14930147818).

19906863748 is a wasteful number, since it uses less digits than its factorization.

19906863748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4976715941 (or 4976715939 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 19906863748 in words is "nineteen billion, nine hundred six million, eight hundred sixty-three thousand, seven hundred forty-eight".