20205220151 has 4 divisors (see below), whose sum is σ = 20216378904. Its totient is φ = 20194061400.

The previous prime is 20205220039. The next prime is 20205220153. The reversal of 20205220151 is 15102250202.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20205220151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205220153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5576660 + ... + 5580281.

It is an arithmetic number, because the mean of its divisors is an integer number (5054094726).

Almost surely, 2^20205220151 is an apocalyptic number.

20205220151 is a deficient number, since it is larger than the sum of its proper divisors (11158753).

20205220151 is a wasteful number, since it uses less digits than its factorization.

20205220151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11158752.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 20205220151 its reverse (15102250202), we get a palindrome (35307470353).

The spelling of 20205220151 in words is "twenty billion, two hundred five million, two hundred twenty thousand, one hundred fifty-one".