20505601 has 8 divisors (see below), whose sum is σ = 21254400. Its totient is φ = 19762320.

The previous prime is 20505599. The next prime is 20505619. The reversal of 20505601 is 10650502.

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 20505601 - 2¹ = 20505599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20505691) 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, 7110 + ... + 9568.

It is an arithmetic number, because the mean of its divisors is an integer number (2656800).

Almost surely, 2^20505601 is an apocalyptic number.

It is an amenable number.

20505601 is a deficient number, since it is larger than the sum of its proper divisors (748799).

20505601 is a wasteful number, since it uses less digits than its factorization.

20505601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2759.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20505601 is about 4528.3110538036. The cubic root of 20505601 is about 273.7101068477.

The spelling of 20505601 in words is "twenty million, five hundred five thousand, six hundred one".