20361605 has 16 divisors (see below), whose sum is σ = 26784000. Its totient is φ = 14736960.

The previous prime is 20361599. The next prime is 20361619. The reversal of 20361605 is 50616302.

It is not a de Polignac number, because 20361605 - 2¹² = 20357509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12371 + ... + 13919.

It is an arithmetic number, because the mean of its divisors is an integer number (1674000).

Almost surely, 2^20361605 is an apocalyptic number.

It is an amenable number.

20361605 is a deficient number, since it is larger than the sum of its proper divisors (6422395).

20361605 is a wasteful number, since it uses less digits than its factorization.

20361605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20361605 is about 4512.3835165021. The cubic root of 20361605 is about 273.0679119199.

Adding to 20361605 its reverse (50616302), we get a palindrome (70977907).

The spelling of 20361605 in words is "twenty million, three hundred sixty-one thousand, six hundred five".