20100705 has 8 divisors (see below), whose sum is σ = 32161152. Its totient is φ = 10720368.

The previous prime is 20100673. The next prime is 20100709. The reversal of 20100705 is 50700102.

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 20100705 - 2⁵ = 20100673 is a prime.

It is a super-3 number, since 3×20100705³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1340047 = 20100705 / (2 + 0 + 1 + 0 + 0 + 7 + 0 + 5).

It is not an unprimeable number, because it can be changed into a prime (20100709) 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, 670009 + ... + 670038.

It is an arithmetic number, because the mean of its divisors is an integer number (4020144).

Almost surely, 2^20100705 is an apocalyptic number.

It is an amenable number.

20100705 is a deficient number, since it is larger than the sum of its proper divisors (12060447).

20100705 is a wasteful number, since it uses less digits than its factorization.

20100705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340055.

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 20100705 is about 4483.3809786812. The cubic root of 20100705 is about 271.8965914944.

Adding to 20100705 its reverse (50700102), we get a palindrome (70800807).

The spelling of 20100705 in words is "twenty million, one hundred thousand, seven hundred five".