20445659 has 8 divisors (see below), whose sum is σ = 22148112. Its totient is φ = 18761760.

The previous prime is 20445637. The next prime is 20445697. The reversal of 20445659 is 95654402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20445659 - 2¹² = 20441563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2297 + ... + 6794.

It is an arithmetic number, because the mean of its divisors is an integer number (2768514).

Almost surely, 2^20445659 is an apocalyptic number.

20445659 is a deficient number, since it is larger than the sum of its proper divisors (1702453).

20445659 is a wasteful number, since it uses less digits than its factorization.

20445659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 20445659 is about 4521.6876274241. The cubic root of 20445659 is about 273.4431433001.

The spelling of 20445659 in words is "twenty million, four hundred forty-five thousand, six hundred fifty-nine".