19714640 has 80 divisors (see below), whose sum is σ = 51264576. Its totient is φ = 6988800.

The previous prime is 19714633. The next prime is 19714663. The reversal of 19714640 is 4641791.

19714640 = T₉₃₆ + T₉₃₇ + ... + T₉₇₈.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 19714597 and 19714606.

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, 37580 + ... + 38100.

Almost surely, 2^19714640 is an apocalyptic number.

19714640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19714640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25632288).

19714640 is an abundant number, since it is smaller than the sum of its proper divisors (31549936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19714640 is a wasteful number, since it uses less digits than its factorization.

19714640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 19714640 is about 4440.1171155725. The cubic root of 19714640 is about 270.1445956177.

The spelling of 19714640 in words is "nineteen million, seven hundred fourteen thousand, six hundred forty".