20010705 has 64 divisors (see below), whose sum is σ = 39674880. Its totient is φ = 8467200.

The previous prime is 20010701. The next prime is 20010721. The reversal of 20010705 is 50701002.

It is a happy number.

It is not a de Polignac number, because 20010705 - 2² = 20010701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (20010701) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40510 + ... + 41000.

It is an arithmetic number, because the mean of its divisors is an integer number (619920).

Almost surely, 2^20010705 is an apocalyptic number.

It is an amenable number.

20010705 is a deficient number, since it is larger than the sum of its proper divisors (19664175).

20010705 is a wasteful number, since it uses less digits than its factorization.

20010705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542.

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

The square root of 20010705 is about 4473.3326502732. The cubic root of 20010705 is about 271.4901827557.

Adding to 20010705 its reverse (50701002), we get a palindrome (70711707).

The spelling of 20010705 in words is "twenty million, ten thousand, seven hundred five".