20561102 has 4 divisors (see below), whose sum is σ = 30841656. Its totient is φ = 10280550.

The previous prime is 20561083. The next prime is 20561111. The reversal of 20561102 is 20116502.

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

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5140274 + ... + 5140277.

It is an arithmetic number, because the mean of its divisors is an integer number (7710414).

Almost surely, 2^20561102 is an apocalyptic number.

20561102 is a deficient number, since it is larger than the sum of its proper divisors (10280554).

20561102 is a wasteful number, since it uses less digits than its factorization.

20561102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10280553.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20561102 is about 4534.4351357143. The cubic root of 20561102 is about 273.9568280499.

Adding to 20561102 its reverse (20116502), we get a palindrome (40677604).

The spelling of 20561102 in words is "twenty million, five hundred sixty-one thousand, one hundred two".