20642205 has 8 divisors (see below), whose sum is σ = 33027552. Its totient is φ = 11009168.

The previous prime is 20642179. The next prime is 20642213. The reversal of 20642205 is 50224602.

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 20642205 - 2⁵ = 20642173 is a prime.

It is a super-2 number, since 2×20642205² = 852201254524050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688059 + ... + 688088.

It is an arithmetic number, because the mean of its divisors is an integer number (4128444).

Almost surely, 2^20642205 is an apocalyptic number.

It is an amenable number.

20642205 is a deficient number, since it is larger than the sum of its proper divisors (12385347).

20642205 is a wasteful number, since it uses less digits than its factorization.

20642205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376155.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20642205 is about 4543.3693444403. The cubic root of 20642205 is about 274.3165618595.

Adding to 20642205 its reverse (50224602), we get a palindrome (70866807).

The spelling of 20642205 in words is "twenty million, six hundred forty-two thousand, two hundred five".