19952565 has 16 divisors (see below), whose sum is σ = 33604800. Its totient is φ = 10081152.

The previous prime is 19952549. The next prime is 19952567. The reversal of 19952565 is 56525991.

It is not a de Polignac number, because 19952565 - 2⁴ = 19952549 is a prime.

19952565 is a modest number, since divided by 2565 gives 1995 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19952567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34720 + ... + 35289.

It is an arithmetic number, because the mean of its divisors is an integer number (2100300).

Almost surely, 2^19952565 is an apocalyptic number.

19952565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19952565 is a deficient number, since it is larger than the sum of its proper divisors (13652235).

19952565 is a wasteful number, since it uses less digits than its factorization.

19952565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70036.

The product of its digits is 121500, while the sum is 42.

The square root of 19952565 is about 4466.8294124580. The cubic root of 19952565 is about 271.2269944458.

It can be divided in two parts, 1995 and 2565, that added together give a triangular number (4560 = T₉₅).

The spelling of 19952565 in words is "nineteen million, nine hundred fifty-two thousand, five hundred sixty-five".