19964545 has 16 divisors (see below), whose sum is σ = 25477200. Its totient is φ = 14966784.

The previous prime is 19964537. The next prime is 19964563. The reversal of 19964545 is 54546991.

It can be written as a sum of positive squares in 8 ways, for example, as 242064 + 19722481 = 492^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 19964545 - 2³ = 19964537 is a prime.

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, 29329 + ... + 30001.

It is an arithmetic number, because the mean of its divisors is an integer number (1592325).

Almost surely, 2^19964545 is an apocalyptic number.

It is an amenable number.

19964545 is a deficient number, since it is larger than the sum of its proper divisors (5512655).

19964545 is a wasteful number, since it uses less digits than its factorization.

19964545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044.

The product of its digits is 194400, while the sum is 43.

The square root of 19964545 is about 4468.1702071430. The cubic root of 19964545 is about 271.2812673223.

The spelling of 19964545 in words is "nineteen million, nine hundred sixty-four thousand, five hundred forty-five".