20445601 has 4 divisors (see below), whose sum is σ = 22304304. Its totient is φ = 18586900.

The previous prime is 20445599. The next prime is 20445613. The reversal of 20445601 is 10654402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20445601 - 2¹ = 20445599 is a prime.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20445001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929335 + ... + 929356.

It is an arithmetic number, because the mean of its divisors is an integer number (5576076).

Almost surely, 2^20445601 is an apocalyptic number.

It is an amenable number.

20445601 is a deficient number, since it is larger than the sum of its proper divisors (1858703).

20445601 is a wasteful number, since it uses less digits than its factorization.

20445601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858702.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20445601 is about 4521.6812138849. The cubic root of 20445601 is about 273.4428847331.

The spelling of 20445601 in words is "twenty million, four hundred forty-five thousand, six hundred one".