20201220106 has 4 divisors (see below), whose sum is σ = 30301830162. Its totient is φ = 10100610052.

The previous prime is 20201220101. The next prime is 20201220107. The reversal of 20201220106 is 60102210202.

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., 20076339481 + 124880625 = 141691^2 + 11175^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20201220106.

It is not an unprimeable number, because it can be changed into a prime (20201220101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050305025 + ... + 5050305028.

Almost surely, 2^20201220106 is an apocalyptic number.

20201220106 is a deficient number, since it is larger than the sum of its proper divisors (10100610056).

20201220106 is a wasteful number, since it uses less digits than its factorization.

20201220106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100610055.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20201220106 its reverse (60102210202), we get a palindrome (80303430308).

The spelling of 20201220106 in words is "twenty billion, two hundred one million, two hundred twenty thousand, one hundred six".