19801948 has 6 divisors (see below), whose sum is σ = 34653416. Its totient is φ = 9900972.

The previous prime is 19801937. The next prime is 19801949. The reversal of 19801948 is 84910891.

It is a self number, because there is not a number n which added to its sum of digits gives 19801948.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19801949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2475240 + ... + 2475247.

Almost surely, 2^19801948 is an apocalyptic number.

It is an amenable number.

19801948 is a deficient number, since it is larger than the sum of its proper divisors (14851468).

19801948 is a wasteful number, since it uses less digits than its factorization.

19801948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950491 (or 4950489 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 19801948 is about 4449.9379770959. The cubic root of 19801948 is about 270.5427946638.

The spelling of 19801948 in words is "nineteen million, eight hundred one thousand, nine hundred forty-eight".