20642105 has 8 divisors (see below), whose sum is σ = 27022464. Its totient is φ = 15012400.

The previous prime is 20642099. The next prime is 20642129. The reversal of 20642105 is 50124602.

It is a happy number.

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

It is not a de Polignac number, because 20642105 - 2¹⁴ = 20625721 is a prime.

It is a Duffinian 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, 187601 + ... + 187710.

It is an arithmetic number, because the mean of its divisors is an integer number (3377808).

Almost surely, 2^20642105 is an apocalyptic number.

It is an amenable number.

20642105 is a deficient number, since it is larger than the sum of its proper divisors (6380359).

20642105 is a wasteful number, since it uses less digits than its factorization.

20642105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375327.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20642105 is about 4543.3583393785. The cubic root of 20642105 is about 274.3161188884.

Adding to 20642105 its reverse (50124602), we get a palindrome (70766707).

The spelling of 20642105 in words is "twenty million, six hundred forty-two thousand, one hundred five".