20019065 has 16 divisors (see below), whose sum is σ = 27587520. Its totient is φ = 13792320.

The previous prime is 20019061. The next prime is 20019073. The reversal of 20019065 is 56091002.

20019065 = T₇₆ + T₇₇ + ... + T₄₉₃.

It is not a de Polignac number, because 20019065 - 2² = 20019061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20019065.

It is not an unprimeable number, because it can be changed into a prime (20019061) 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, 8534 + ... + 10623.

It is an arithmetic number, because the mean of its divisors is an integer number (1724220).

Almost surely, 2^20019065 is an apocalyptic number.

It is an amenable number.

20019065 is a deficient number, since it is larger than the sum of its proper divisors (7568455).

20019065 is a wasteful number, since it uses less digits than its factorization.

20019065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19192.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20019065 is about 4474.2669790704. The cubic root of 20019065 is about 271.5279848876.

The spelling of 20019065 in words is "twenty million, nineteen thousand, sixty-five".