19724045 has 16 divisors (see below), whose sum is σ = 26248320. Its totient is φ = 14107200.

The previous prime is 19724039. The next prime is 19724093. The reversal of 19724045 is 54042791.

It is a happy number.

It is not a de Polignac number, because 19724045 - 2¹⁰ = 19723021 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, 416 + ... + 6294.

It is an arithmetic number, because the mean of its divisors is an integer number (1640520).

Almost surely, 2^19724045 is an apocalyptic number.

It is an amenable number.

19724045 is a deficient number, since it is larger than the sum of its proper divisors (6524275).

19724045 is a wasteful number, since it uses less digits than its factorization.

19724045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5956.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 19724045 is about 4441.1760829762. The cubic root of 19724045 is about 270.1875468797.

It can be divided in two parts, 197 and 24045, that added together give a palindrome (24242).

The spelling of 19724045 in words is "nineteen million, seven hundred twenty-four thousand, forty-five".