19908513 has 12 divisors (see below), whose sum is σ = 30448548. Its totient is φ = 12491520.

The previous prime is 19908481. The next prime is 19908563. The reversal of 19908513 is 31580991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16548624 + 3359889 = 4068^2 + 1833^2 .

It is not a de Polignac number, because 19908513 - 2⁵ = 19908481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19908563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64908 + ... + 65213.

It is an arithmetic number, because the mean of its divisors is an integer number (2537379).

Almost surely, 2^19908513 is an apocalyptic number.

It is an amenable number.

19908513 is a deficient number, since it is larger than the sum of its proper divisors (10540035).

19908513 is a wasteful number, since it uses less digits than its factorization.

19908513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130144 (or 130141 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 19908513 is about 4461.8956733658. The cubic root of 19908513 is about 271.0272390843.

The spelling of 19908513 in words is "nineteen million, nine hundred eight thousand, five hundred thirteen".