19885745 has 12 divisors (see below), whose sum is σ = 26230260. Its totient is φ = 14461920.

The previous prime is 19885739. The next prime is 19885753. The reversal of 19885745 is 54758891.

It can be written as a sum of positive squares in 2 ways, for example, as 9284209 + 10601536 = 3047^2 + 3256^2 .

It is not a de Polignac number, because 19885745 - 2⁶ = 19885681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19885745.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15830 + ... + 17039.

It is an arithmetic number, because the mean of its divisors is an integer number (2185855).

Almost surely, 2^19885745 is an apocalyptic number.

It is an amenable number.

19885745 is a deficient number, since it is larger than the sum of its proper divisors (6344515).

19885745 is a wasteful number, since it uses less digits than its factorization.

19885745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32896 (or 32885 counting only the distinct ones).

The product of its digits is 403200, while the sum is 47.

The square root of 19885745 is about 4459.3435615570. The cubic root of 19885745 is about 270.9238812556.

It can be divided in two parts, 198857 and 45, that multiplied together give a triangular number (8948565 = T₄₂₃₀).

The spelling of 19885745 in words is "nineteen million, eight hundred eighty-five thousand, seven hundred forty-five".