20900051 has 2 divisors, whose sum is σ = 20900052. Its totient is φ = 20900050.

The previous prime is 20899993. The next prime is 20900053. The reversal of 20900051 is 15000902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20900051 - 2¹⁸ = 20637907 is a prime.

Together with 20900053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20900053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10450025 + 10450026.

It is an arithmetic number, because the mean of its divisors is an integer number (10450026).

Almost surely, 2^20900051 is an apocalyptic number.

20900051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20900051 is an equidigital number, since it uses as much as digits as its factorization.

20900051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 20900051 is about 4571.6573581142. The cubic root of 20900051 is about 275.4540202558.

Adding to 20900051 its reverse (15000902), we get a palindrome (35900953).

The spelling of 20900051 in words is "twenty million, nine hundred thousand, fifty-one".