20235706 has 4 divisors (see below), whose sum is σ = 30353562. Its totient is φ = 10117852.

The previous prime is 20235697. The next prime is 20235727. The reversal of 20235706 is 60753202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19316025 + 919681 = 4395^2 + 959^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5058925 + ... + 5058928.

Almost surely, 2^20235706 is an apocalyptic number.

20235706 is a deficient number, since it is larger than the sum of its proper divisors (10117856).

20235706 is a wasteful number, since it uses less digits than its factorization.

20235706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10117855.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20235706 is about 4498.4114974066. The cubic root of 20235706 is about 272.5039406887.

Adding to 20235706 its reverse (60753202), we get a palindrome (80988908).

The spelling of 20235706 in words is "twenty million, two hundred thirty-five thousand, seven hundred six".