19800015 has 16 divisors (see below), whose sum is σ = 31850496. Its totient is φ = 10503200.

The previous prime is 19799993. The next prime is 19800083. The reversal of 19800015 is 51000891.

It is not a de Polignac number, because 19800015 - 2⁷ = 19799887 is a prime.

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, 591 + ... + 6320.

It is an arithmetic number, because the mean of its divisors is an integer number (1990656).

Almost surely, 2^19800015 is an apocalyptic number.

19800015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19800015 is a deficient number, since it is larger than the sum of its proper divisors (12050481).

19800015 is a wasteful number, since it uses less digits than its factorization.

19800015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 19800015 is about 4449.7207777567. The cubic root of 19800015 is about 270.5339912162.

The spelling of 19800015 in words is "nineteen million, eight hundred thousand, fifteen".