19739968 has 14 divisors (see below), whose sum is σ = 39171626. Its totient is φ = 9869952.

The previous prime is 19739959. The next prime is 19739977. The reversal of 19739968 is 86993791.

It is an interprime number because it is at equal distance from previous prime (19739959) and next prime (19739977).

It can be written as a sum of positive squares in only one way, i.e., 19642624 + 97344 = 4432^2 + 312^2 .

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, 154155 + ... + 154282.

Almost surely, 2^19739968 is an apocalyptic number.

It is an amenable number.

19739968 is a deficient number, since it is larger than the sum of its proper divisors (19431658).

19739968 is an equidigital number, since it uses as much as digits as its factorization.

19739968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308449 (or 308439 counting only the distinct ones).

The product of its digits is 734832, while the sum is 52.

The square root of 19739968 is about 4442.9683771101. The cubic root of 19739968 is about 270.2602337808.

The spelling of 19739968 in words is "nineteen million, seven hundred thirty-nine thousand, nine hundred sixty-eight".