19500013 has 8 divisors (see below), whose sum is σ = 21045528. Its totient is φ = 17961024.

The previous prime is 19499983. The next prime is 19500017. The reversal of 19500013 is 31000591.

19500013 = 3122² + 3123².

It can be written as a sum of positive squares in 4 ways, for example, as 157609 + 19342404 = 397^2 + 4398^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19500013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19500017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5895 + ... + 8587.

It is an arithmetic number, because the mean of its divisors is an integer number (2630691).

Almost surely, 2^19500013 is an apocalyptic number.

19500013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19500013 is the 3123-rd centered square number.

It is an amenable number.

19500013 is a deficient number, since it is larger than the sum of its proper divisors (1545515).

19500013 is a wasteful number, since it uses less digits than its factorization.

19500013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 19500013 is about 4415.8819051238. The cubic root of 19500013 is about 269.1606904178.

The spelling of 19500013 in words is "nineteen million, five hundred thousand, thirteen".