20512101 has 4 divisors (see below), whose sum is σ = 27349472. Its totient is φ = 13674732.

The previous prime is 20512087. The next prime is 20512139. The reversal of 20512101 is 10121502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20512101 - 2⁷ = 20511973 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 (20512181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3418681 + ... + 3418686.

It is an arithmetic number, because the mean of its divisors is an integer number (6837368).

Almost surely, 2^20512101 is an apocalyptic number.

It is an amenable number.

20512101 is a deficient number, since it is larger than the sum of its proper divisors (6837371).

20512101 is an equidigital number, since it uses as much as digits as its factorization.

20512101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837370.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 20512101 is about 4529.0287038172. The cubic root of 20512101 is about 273.7390246012.

Adding to 20512101 its reverse (10121502), we get a palindrome (30633603).

The spelling of 20512101 in words is "twenty million, five hundred twelve thousand, one hundred one".