20365642 has 16 divisors (see below), whose sum is σ = 33426432. Its totient is φ = 9229120.

The previous prime is 20365637. The next prime is 20365691. The reversal of 20365642 is 24656302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20365642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7218 + ... + 9634.

It is an arithmetic number, because the mean of its divisors is an integer number (2089152).

Almost surely, 2^20365642 is an apocalyptic number.

20365642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20365642 is a deficient number, since it is larger than the sum of its proper divisors (13060790).

20365642 is a wasteful number, since it uses less digits than its factorization.

20365642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20365642 is about 4512.8308188985. The cubic root of 20365642 is about 273.0859573591.

The spelling of 20365642 in words is "twenty million, three hundred sixty-five thousand, six hundred forty-two".