19885515 has 16 divisors (see below), whose sum is σ = 34264608. Its totient is φ = 9789696.

The previous prime is 19885513. The next prime is 19885519. The reversal of 19885515 is 51558891.

It is not a de Polignac number, because 19885515 - 2¹ = 19885513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19885513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50794 + ... + 51183.

It is an arithmetic number, because the mean of its divisors is an integer number (2141538).

Almost surely, 2^19885515 is an apocalyptic number.

19885515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19885515 is a deficient number, since it is larger than the sum of its proper divisors (14379093).

19885515 is a wasteful number, since it uses less digits than its factorization.

19885515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101998.

The product of its digits is 72000, while the sum is 42.

The square root of 19885515 is about 4459.3177729334. The cubic root of 19885515 is about 270.9228367430.

It can be divided in two parts, 1988 and 5515, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 19885515 in words is "nineteen million, eight hundred eighty-five thousand, five hundred fifteen".