20261051 has 4 divisors (see below), whose sum is σ = 20517600. Its totient is φ = 20004504.

The previous prime is 20261039. The next prime is 20261071. The reversal of 20261051 is 15016202.

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

It is a cyclic number.

It is not a de Polignac number, because 20261051 - 2¹⁴ = 20244667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20261071) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 128156 + ... + 128313.

It is an arithmetic number, because the mean of its divisors is an integer number (5129400).

Almost surely, 2^20261051 is an apocalyptic number.

20261051 is a deficient number, since it is larger than the sum of its proper divisors (256549).

20261051 is an equidigital number, since it uses as much as digits as its factorization.

20261051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256548.

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

The square root of 20261051 is about 4501.2277214111. The cubic root of 20261051 is about 272.6176626232.

Adding to 20261051 its reverse (15016202), we get a palindrome (35277253).

The spelling of 20261051 in words is "twenty million, two hundred sixty-one thousand, fifty-one".