20945051 has 2 divisors, whose sum is σ = 20945052. Its totient is φ = 20945050.

The previous prime is 20945039. The next prime is 20945053. The reversal of 20945051 is 15054902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20945051 is a prime.

It is a super-2 number, since 2×20945051² = 877390322785202, which contains 22 as substring.

Together with 20945053, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20945051.

It is not a weakly prime, because it can be changed into another prime (20945053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10472525 + 10472526.

It is an arithmetic number, because the mean of its divisors is an integer number (10472526).

Almost surely, 2^20945051 is an apocalyptic number.

20945051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20945051 is an equidigital number, since it uses as much as digits as its factorization.

20945051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20945051 is about 4576.5763404536. The cubic root of 20945051 is about 275.6515723306.

Adding to 20945051 its reverse (15054902), we get a palindrome (35999953).

The spelling of 20945051 in words is "twenty million, nine hundred forty-five thousand, fifty-one".